If you don't shop much at an alternative online retailer, Amazon is probably your go-to source for online shopping.

We recently showed you some awesome Amazon tips for getting more out of their service, but there are plenty of great resources outside of Amazon, too.

These services are focused on helping you save money on Amazon shopping, and offer a nice range of tools to help you in that quest. Since Amazon runs separate websites for the UK and USA, we'll take a look at a few sites by region. Happy saving!

Super Saver Delivery Tool (UK)

On Amazon UK, any order that comes to £20 or more qualifies for free shipping. If you're just a bit short of this total, however, you'll probably end up paying more money in shipping than you would buying an additional item to break £20. The Super Saver Delivery Tool finds items to help you cross the threshold.

Simply input your current subtotal, and the tool will pull in small items to help you get to £20. When I put in £19, for example, I was greeted with a screwdriver, aerosol deodorant, and a tube of toothpaste, each for £1. These might not be items you need immediately, but it's better to spend the extra pound and stock up on toothpaste than to waste it on shipping.

Super-Saver-Tool-UK

Next time you're just shy of the £20 goal, try this to grab a silly office item and save in the long run.

Curiua (EU)

Curiua lets you search several vendors in the EU at once to compare prices. By visiting their settings page, you can choose which nation you're in and the site will hide retailers who don't deliver to your country.

When you're not sure what to shop for, the home page carries some "Great Deals" to browse, as well as a live list of what others are searching for on the site. Once you select an item, you can compare the prices from eligible vendors — just remember these don't include shipping.

Curiua-EU

I've set my country here to Italy as an example. You can see the price differences in euros for several different countries, and it's pretty significant: ordering this external hard drive from Amazon Italy would cost almost 70% more than buying it from Amazon UK.

If you don't mind waiting for the longer shipping time, buying from a vendor in another country could save a good amount. Try it just to see what items go for outside your country!

Amazon Discount Finder (UK)

This one is for the bargain hunters. Amazon Discount Finder on MoneySavingExpert.com finds all sorts of deals on Amazon in any of its departments.

Upon visiting the site, you'll need to select a department and can sort further by sub-categories if you wish. The site even allows you to add keywords — useful if you're looking for an item that might have lots of variations.

You can then adjust the discount percentage you're looking for; if you're feeling particularly cheap, you could only search for items that are 75% off or more! Since percentages can vary, you can also specify a minimum or maximum price to weed out excessively cheap or expensive goods. Once you're done, the search simply takes you to an Amazon results page with all your filters applied.

Amazon-Discount-Finder-UK

There's no telling what kinds of discounts you'll discover using this tool, but the site reminds you to keep a few tips in mind: ensure the discount is correct since these prices are generated automatically, always compare prices (using Curiua, above!) and be wary of third-party sellers on Amazon. While a third-party vendor might have a bargain, it can be a pain to return an item to them vs. returning to Amazon themselves, so take that into consideration.

Amazon Filler Item Finder (US)

Amazon Filler Item Finder is the US equivalent to the Super Saver Delivery Tool for UK shoppers. Amazon requires you to spend $35 in the USA to get free shipping (if you don't have Amazon Prime), so if you're just a few dollars short you can use this tool to find items to help you cross that amount.

The search results aren't quite as attractive as the UK edition, but it puts popular items in bold and shows images for extra-popular items, so you know what others typically buy.

Amazon-Filler-Item-Finder-US

I typed in $5.39 just to test it, and found nine items for exactly that price — among them were a few books, a mousepad, and a dog toy. Even though you have to spend a little more than you first expected, this site wants you to find something that's still useful. If you wanted a new book to read or were low on dog toys, this would be a great time to get them!

Don't forget, though: with the extra money you spend to get free shipping, you could instead subscribe to Amazon Prime and get a lot of extra benefits.

PriceJump (US)

PriceJump allows you to find out if Amazon has the best price on an item. If you primarily shop at Amazon, this is a great tool to use to ensure you're not paying too much. Though Amazon often has the best price, that's not always the case.

After you input your search term, you'll find a list of items that match it. Choosing one allows you to compare its price with other retailers, doing the work of visiting multiple sites for you. It's not a perfect service, however: the number of alternative retailers depends on the type of item, and they aren't always exhaustive.

PriceJump-US

For example, I looked up the PlayStation 4's DualShock 4 controller, and the only site it found was Sears, even though Newegg carries the item. Thus, PriceJump should be a starting point in your quest for the lowest price, but don't completely rely on it.

Your Shopping Companions

No matter whether you're in the US or EU, you have several shopping assistants at your disposal in these websites. Just remember that while they'll save you a lot of time and menial work, they aren't perfect. For free tools, though, they'll come in really handy and they're much better than manually hunting for discounts or small items to get free shipping.

Are browser extensions more your style? We've got a list of the best Chrome extensions for Amazon shopping.

Which third-party Amazon tool is your favorite? What's the best companion site we missed here? Let us know in the comments!