I prefer to use Sam's Club (never tried WalMart) over iPhoto because you can order the prints and pick them up in an hour. Beats the heck out of waiting for the prints in the mail.

I've printed hundreds and hundreds of pictures from iPhoto, Walgreens, Wal*Mart, and Target. So far, the Kodak pics from iPhoto are by far the best. Most of the others tend to have color balance issues, ESPECIALLY the one-hour photos

... as it uses top-of-the-line Fuji machines with Fuji Crystal paper. You can even go to some website, don't remember it offhand, and download the color profile of the machine in your local WalMart or SamsClub. Use that profile in Photoshop to tweak the color just right, and you're set to go.

as of this posting here are the prices for sam's. pickup is usually about 2 hours at my store, quality is the same as any vendor using the high quality fuji processors. their upload site works fine with macs but is a tiny bit tricky the first time you use it. enjoy

Individual Prints
Size Mail Order Price 1 Hour Price 2-3 Day Price
4 x 6 $0.11 $0.17 $0.14
5 x 7 $0.56 $0.38 $0.56
8 x 10 $1.58 $1.46 $1.58
Wallets (2) $0.28 $0.36 $0.28

Wife has used Sams on a couple of occasions and the quality has been fine. Cold, but that's to be expected with Fuji. I had both Fuji and Xerox at work and prefered Xerox Laserprints to Fuji Dye-sub prints. Put identical 8x10s in a frame and stand back and view from a normal distance. You can't see any qualitative differances between the two. Cost savings though are tremendous.