Check this out! I recently found Bride on a Budget's blog, and she has some really good thrifty advice for planning a wedding on a budget. She's planning a March 2010 wedding on a $7,000 budget!
Every week, she keeps us brides up-to-date with money-saving opportunities like this one--(50 ct.) 7 x 5" (folded to 3.5 x 5") Custom Thank You Cards with plain envelopes from Uprinting.
Check out her blog for more details on this giveaway! Good Luck!