I ordered my Save the Dates tonight (since I finally have my engagement photos done and back!) and I got them from magnetstreet.com. It's a great site since you can change the colors to match yours and there are so many different layouts to pick from. I got magnet stds and they were $1.09 a piece and on top of that I had a coupon code for 25% off my purchase, so I got a bunch more off! Love it!
The code is good until Wednesday if anyone is interested:
WED25THANKS