Here are a couple links to stamped patterns. This is a European site so the cost will be slightly more with the currency conversion, the cost should be just under $4.00 US. The first link is a boy receiving first communion. The other link will take you to the website displaying several First Communion patterns that come is a variety of stitching methods. If you see a pattern you like read the full description to see if it is available as a stamped pattern.
http://www.en.coricamo.com/set,92296,first-holy-communion-boy-b-sikora.htm
Select "Tapestry Aida" for the stamped version after clicking on pattern.
http://www.en.coricamo.com/sets,3051,my-first-communion,my-first-communion.htm
It is hard to find stamped patterns but maybe someone else might have a better idea. I've ordered from Europe, Australia and the UK before without any problems. The companies I have dealt with, their customer service has been excellent.