I’m looking for a Netbook with Ubuntu Netbook on it, maybe under $300 with an integrated wireless card. Any thoughts?
You can get pretty much any netbook you like and then install Ubuntu Netbook edition. The only difference is that if you buy a netbook with U.N. is that it will be 100% compatible, but that is not really a plus unless you end up with a netbook with very weird specs.
I found this link in the Ubuntu Website with a list of vendors that sell computers with ubuntu PreInstalled:
You could take a look at the Dell Mini series, they come with Windows 7 but you can fix that yourself very easily:
A directory of places where you can get hardware with Ubuntu PreInstalled:
Hope it all helps.
That's pretty generic and just about any standard netbook should fit your requirements (you'd porbably be best off installing Ubuntu Netbook yourself)
Places like TigerDirect, Newegg, and Microcenter normally have netbooks for $260 and any common netbook like an Acer Aspire One should have Linux support.