Great Printing Source
This is where I order most of my personal prints for 4 by size up to 20 by 30 inch sizes. They have great service and a fast turn around time (in my experience 3 to 4 days).

York Street Video
I met Ken McKnight at a wedding I recently photographed and liked the easy way he worked with the couple and me. He is as reasonably priced as me. Check him out.