You're probably going to hear "anything more than 2¢ is rape". In today's market, you will probably b
e paying something like 8-9¢, and small vs large shouldn't make much difference in price, but will affect availability.
EDIT:
@BONESTOCK beat me to the reply. Also, keep in mind that on-line dealers will likely charge both a shipping and hazmat fee. So an advertised $85/1000 will be closer to $110/1000. It isn't uncommon to see primers advertised on-line for $120 - $160/1000 not including the shipping/hazmat! I hate to say it, but if you can find primers at less than 10¢ per (all in), you might want to do some stocking, even at those terrible prices. It's always possible that prices will come down, but folks have been predicting that for 3 years now, and the market has settled around the 9¢ mark. Given inflation and demand, it's also possible the prices will continue to rise to new rape levels...