
Kickass! I found some packaging I could use on the miniposters.

I found
Clear Plastic Tubing that I could use to pre-roll posters and have them all nice and bagged. To top it off I could get some tiny little stickers made to put on the outside of the plastic tubing, so they would be easy for people to grab off the table, and relatively well protected to boot!
My cunning plan is to order one of each poster on cardstock and on that poster, have a the corner sorta stamped in Photoshop with a "POSTER TITLE: POSTER DIMENSIONS: POSTER PRICE" stamp on the lower left so people know it's signage :-) These could hang from a keen PVC pipe rig off the top of the table, so people could see the posters but they wouldn't take up table space. Underneath, I could build a really cute wooden box with lots of compartments inside, maybe 12. I could spray paint it back and then put the bagged/rolled/sticker-labeled posters inside.
It would make the posters take up minimal table space, keep them safe, keep them easy to grab, and the hanging posters would be eye-catching from a distance!
Thanks to everyone on the price/paper recommendations. I got an almost 50/50 split on the paper for what people said they would prefer, but in the end, neither is really a bad choice: The posters look great either way. The storage/mailing/display issue made poster-paper the natural choice. I will most likely be pricing the posters at $12 each or 3/$30. We'll see.
I'm so excited! Mind you, these wont' be ready anytime amazingly soon. I want to place an order for the miniposters all at once. To do that, I have to have roughly 8 poster designs that I am fond of AND work on 11x17 dimensions. Then I also have to place sticker orders, make signage, then roll and package everything. I hope to have these ready early fall though. Having miniposters would rock :-)