Many people don't realize that Amazon Prime comes with many benefits on top of free two-day shipping, such as Prime TV and unlimited photo storage. If you don't have Prime yet, you should really consider it.

However, even if you don't have Prime, there's still a way for you to get free shipping on orders: by spending at least $35. This only works for items marked as eligible, but most items sold through Amazon are eligible, so it's nothing to worry about.

But wait, there's one more trick you should know.

Let's say you want to buy an item worth $30, or two items worth $15 each, with a shipping fee of $5. Instead, why not tack on an item worth $5 in order to unlock free shipping? If you do that, the additional item is basically free, isn't it?

Here's the trick: Use an "item filler" website to find cheap items that fill out your cart and help you reach the $35 threshold. There are many item filler websites to choose from, but SuperFillers and FillerItemFinder are both pretty good.

If you can find small items that you'll eventually need anyway -- like toilet paper, batteries, all-purpose cleaner, etc. -- then you won't be wasting any money at all.

To be clear, this is a technique that's best for one-off purchases where you just need a few more dollars to unlock free shipping.If you regularly buy from Amazon throughout the year, a subscription to Prime is more than worth it.

Have you ever used an item filler service? Do you think it's worth the effort? Or would you recommend Prime instead? Share with us below!

Image Credit: Amazon Mobile by Denys Prykhodov via Shutterstock