As I talked about here, we are doing postcards for our Save the Dates (unfortunately we don't get to save on postage because we chose over-sized postcards - reduced postage only applies to standard sized postcards).
As a reminder, here is the back side of our postcard. Our return address was also printed in the upper left-hand corner (I just cropped it off, so I could post it on here).
Then, my fiance came to the rescue with his brilliant idea. Why don't we just print directly onto the postcards. Why didn't we think of it sooner? However, the postcards were too thick (we ordered the heaviest cardstock option so that it wouldn't get destroyed in the mail) and we couldn't get them to run through our printer. Even better idea - have someone do it for us. We took our Save the Dates and our list of addresses over to Office Max and told them what they wanted. They said it wasn't a problem at all and that they would have them done in 1 day. All we had to do was provide the addresses in an excel document and they did the rest.
And is was surprisingly inexpensive. (Drumroll please....) It cost us $3.57 to have addresses printed on all 50 of our Save the Dates! Maybe this will also work for the wedding invitations. Fingers- crossed.