Portable external drive for less than $50?

I'd like to buy a second backup drive, since our Seagate is nearly 3 years old, but I need it to be somewhere around the $30 range. All of the ones I find though seem to have 1TB of storage (I haven't managed to fill our 500GB SeaGate with 3 different computers, and now we only have 2!), and I am not convinced I really need that much room, plus they are out of the budget. I do like the dashboard that came with our old drive, so would prefer one that has some sort of backup software.

Any brand or spec recommendations that would come in at my budget?

Thanks!