There are software based implementations of USB for a lot of Atmel chips. But in most cases there is probably too much overhead in using the software approach.
The other option would be to get a SMD chip and then just use a breakout board. They are available dirt cheap from e-bay and SMD devices aren't that hard to solder with a normal soldering iron.
That being said... I would gladly make available for sale any chip you wanted on some sort of breakout board.