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What would be some other countries that fit into hat same category of producing "sticker" stamps?
There are more than I can count! Most of the time, these nations are grouped into geographies like "Dunes" (middle eastern nations), "Island nations" (in particular, Caribbean and South Pacific island nations), and former "Eastern block" nations (Soviet Union, Poland, Romania, etc). These barely scratch the surface!
I'll add one more thing - a philatelic term known as Cancelled To Order (CTO). This term is used to describe stamps from nations who postmarked stamps to be sold to collectors as used stamps. Most of the time, these stamps have small postmarks that barely touch the corner of a stamp and original gum on the back. Values on these stamps is usually minimal.
Cheers!
Brian