MS Word has all kinds of templates with more on the web. I used a certificate/awards template recently to generate a 50% off certificate that I donated to a silent auction for a fund raiser. There are lots of different versions out there at no or low cost if you already have MS Word.
There are also some web based printing sites that you can use their design software and order your printing from them (Gotprint.com is one I have used)
If you are mailing out post cards, check out USPS.com is supposed to have an on-line printing, mailing service.
Jim

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002