I received an email from NPL (see my November post re Nations Photo Lab) indicating that, through 12/3/09, they are taking 30% off enlargements (following sizes: 16x20, 16x24, 20x30 and 24x36). I believe I provided a link to the website in my prior post, otherwise, just google Nations photo lab and you'll get there. Here you go: http://www.nationsphotolab.com/ No code appears to be necessary.
I am not taking advantage of the offer (I don't presently have anything that I wish to enlarge so much), so I can't tell you what I think. If you try it, be sure to come back here and post.