posters.org
Film one-sheets, gig posters, Swiss design reprints, political archives, museum shop inventory, student wall decoration. The poster market runs from a few pounds to five figures and none of it has gone away.
The plural noun for the whole spread is here. For a retailer that means owning the shelf position in a buyer’s head, which no advertising budget substitutes for. People search the word, not a description of it.
The archive reading is the one worth dwelling on. Poster collections sit with libraries, design schools, political movements and national institutions, all of which use .org as a matter of course. A digitised collection at this address would carry authority before a visitor read a caption, and institutional archives attract funding that commercial sites never see.
Clean, plural, one word, and no market on earth spells it differently.
The name is listed for sale. Offers welcome.