> half-price stamps

Who is selling half-price stamps?

#1 How big is your potential market? It's people still mailing things from home, who haven't figured out how to do postage on their computer.

#2 Of the population in #1, it's those who find real stamps so expensive that it's worth bothering with discounts.

#3 Of the population in #2, it's those who would want to buy something fraudulant (or not know better) and who would want to risk using it.

#4 Considering the size of the #3 population, how many stamps do they use in a month?

#5 What is your margin on a half-price stamp? You have to pay for advertising, printing (we're talking a profit margin under $1), packaging, and your own time, but at least shipping is free!