Take small Russian towns that have never seen a tourist. Muddy streets, big run down local kremlins with jackdaws living in the hedge, kind people. And once, still during the Socialist era, I found the posters. The hardest part was to ship them out of the country. I was not sure at all if the shipments will ever arrive.
Posters get pretty heavy.
It was quite a good idea to get the posters then since only a few years later, the government decided that the posters are not timely anymore and that they should be destroyed. And just as massive operation as the printing was, the same applied to the destroing. Very few posters were saved since nobody there realized that they have any value. I will hopefully travel some more and in each country, I will be looking for posters. The first country where I did that was Cuba.