I've also had a couple of prints done at Adorama for about the same price and they looked very good too. You have to download software, but the process is very easy. I'm not using them anymore because of the wait time and possibility of damage in transit (never happened to me though). After that, I started to use a local store with a Fuji Frontier at about $2 for either size, but max on that machine is 10x15. However, all of the prints have the grocery store's name on the back of them, not very professional! The prints are very good and I'll still use them when I need something quick.

I'm going to start using Mpix.com, but haven't placed an order yet. They have three different papers (standard color, a matte finish; Kodak Metallic which is hard to describe; and "true" b&w). Check out their website and they'll send you samples images on the three papers. They also do very large prints and are a division of a well known pro lab (Millers Labs).