Recommendations on a portable digital photo frame

[Swimalie]

I am thinking of getting one for my mom for her birthday. She travels a lot between her house and her condo so taking pictures of her grandson along would be nice. I don't want a Kodak one since she was given one once and it crashed her computer (and I was given a one and it died after 3 uses). Any one have any recommendations on a good, small (3.5" or so) framed one? I'd like to keep the price around $50 or less and make it as user friendly as possible. If she didn't have to install software on her PC computer, even better.