Whatever your choices are, pick one with the highest mega pixel, OPTICAL, not digital zoom. And make sure it has USB (2.0 preferred).
Walmart is fine but I'd check Bestbuy, Circuit City websites and look for current rebates on digi cams. I have always had good luck with mail in rebates. It'd take a few weeks but you can save more that way.
Check out pricewath:
http://www.pricewatch.com/
Before you place an order, check out the store review posted by previous buyers. Watch out for stores i NY, lots of scams out there!
sashime76