I wrote this customer review (see below) for amazon.com, about those Colbert zazzle stamps.
In case that the review will not appear, for whatever reason, I am posting it here. :)
"If you want to use any of the normal stamps mass-printed by the millions by USPS, then you pay them face value. Or slightly below, at Costco, if you buy at least 100 stamps.
If you want the PRIVILEGE of choosing a cool CUSTOM DESIGN for such a stamp (YOUR design or somebody else's - but not from USPS), then you can choose from the few officially-licensed vendors of USPS.
THAT'S WHY it costs you more: because you CAN CHOOSE or CREATE the stamp DESIGN. :) Also, the worldwide print run can be as low as 20 stamps - not in the millions!
Also, you may get "customized postage" images of LIVING PEOPLE (including you), PETS, etc. which USPS would NEVER feature!
My favorite such vendor, by far, is the one shown in Stephen Colbert videoclip: zazzle.com, which offers you the option to not only buy your "personalized stamps", but also sell them in the Public Gallery at Zazzle.
No competitor matches zazzle in that, and in creative possibilities for you, for stamps and hundreds of other products.
Zazzle is not flawless, and I addressed that, too, in my blog Dorincard.
At zazzle, ANYBODY in the world can DESIGN AT NO COST ("FOR FREE"="FOR FOR NOTHING"), and if anybody buys something, a royalty will be paid to the creator.
I know from experience, because I designed, bought and sold numerous "personalized stamp" designs.
See my blog for images, comments, tips and tricks about that. :)"