I bought the Target one for 49.99 on Friday. They had plenty.
I figured I could take it home and load it up with pictures - then send it on it's way pre-loaded for my DH. The cheaper ones I've seen all need you to buy a memory card or use a USB jump drive.
Well, sadly - the Target one lasted about 5 minutes. I turned it off to run to Staples to buy a memory card and the frame wouldn't come on after the first time being turned on. It even smelled like a circuit card fried or something. -- I ended up taking the cheap thing back to Target - and buying a Kodak photo printer from Walmart for 69.99 - and the card there for $12.
Just me, but if you bought the $49 one from Target, I'd check it out.
Good Luck