Store has two Sony Reader's NIB - should I buy one?

Hey there!

There's a store not too many miles from me that's selling two Sony Reader Pocket Edition's in Silver, new in the box. From what I could look up on the internet, I don't know if it's the PRS-300 or 350. I want to think it's the 350. They've been on clearance for $79, but I think I could get them to go lower. Should I buy one or is it not a good buy at this point?

Thanks!
Tommy