I have no idea what the market is for the more well-known spin-off products like these tattoos, posters, etc. It would seem demand is low, but because most long-time returning collectors probably assembled sets years ago and salted them away, there is also not much free-floating product in the marketplace. It’s probably a safe bet that the total volume of each in the hobby is just a tiny fraction of OS stickers, just based on the comparative sales volumes back in the day. From my recollection your local candy store/newsstand would have one stinking Wacky box on the counter, and you had to cross your fingers that it wasn’t empty. Who was selling these posters and tattoos? Baffles me to this day.
Anyway, that’s the perception I get, could be wrong, who knows. But I see you’re getting crickets to your post, thought I’d just opine a bit about the subject.