Cheap-postcards.co.uk - - Selling packages of postcards to use for entering UK postal entry competitions. Includes postcard competition listings and free newsletter.
Print 4 U - - Service offering handprinted postcards and papers for use in entering snail mail sweepstakes. Free samples are available.
Sweepstake Supplies - - Selling colored envelopes, postcards, and other supplies to use when entering snail mail sweepstakes. Includes tips and links for sweepers.
Sweeps2Win - - Software for conducting sweepstakes on websites. Includes demo and purchase information.