You get what you pay for. I recently had a photograph printed at Walmart to see how they did... Not well.
The picture was way to dark and was had some odd things going o with the text. I uploaded the same picture to MPIX.com last night and placed the order.
I have ordered from them before and was very pleased with the results so I hope this goes well too.
4/6/10 - The new picture arrived from MPIX yesterday and I put it in my office today. The picture is still about 3% darker than I would like but that is a result of not having a calibrated monitor to work with.
MPIX did a much better job processing the picture with no magenta shade like Walmart and the picture is what I can believe is true to color.
The last bonus of MPIX... They ship the pictures flat, unlike Walmart who ships is a tube with the picture rolled up.