What the posters sold for depended on what the poster was and how much the dealer paid wholesale to get it. Back then, the general rule of thumb was $4. - $6. for a new poster wholesale, which meant you had to sell it for $10 - $12. retail to make a decent profit on it. Of course the major films like any Star Wars, Bond, or a good Eastwood poster would wholesale for more, so the dealer in turn had to sell it for more. That's why any dealer with a good connection into NSS was coveted; whatever NSS had, that dealer could get and usually in quantity.
A long time ago, the Cleveland Comic Book Company had direct entre with Continental Lithograph, which printed the posters for NSS. They had giant amounts of everything - 1-sheets, lobby sets, inserts, 22x28's everything. They used to have package deals like 100 different 1-sheets for $250, 50 different inserts for $75, etc. Several times I would order 50 or 100 different inserts, take out the better titles and hold them for the Christmas season. The rest I would put on backings and bags from Bags Unlimited and blow them out at $6.00 or $7.00 each. Of course, the guys at Cleveland weren't stupid. You never got any Star Wars, Clint, or OO7 at that price, but you did get a nice amount of sellable, mainstream titles and always in mint condition.