Anything above ~3-4 Mpix in a $250 consumer camera is meaningless.
I suggest:
Canon A610 or A620 if you want to use AA batteries.
Canon SD400 or SD450 if you want a smaller camera.
Canon S1 IS if you want a great zoom (10x optical), but its a bit larger.
dpreview.com has a ton of camera reviews once you narrow down the models you're looking at.
One warning about buying online is that there are a lot of shady sites. They'll put out low prices and then claim its backordered (because, of course, it's not the North America version of the camera) and try to upsell you to the North American version with overpriced accessories. Buy from somewhere reputable like Amazon or Dell (both of which usually have good discounts or coupons).