have you ever seen those old record holders the metal ones they are great for what you need just lift the back end up to put it on more of an angle and your away

I agree with whitewolf... I have several of those which I took every other "wrung" out and use it just like you would going through posters!  I also have tons of little brass stands that you can get at walmart for under $1 a piece, I just take the ends and bend them up so my work fits snug on them.  I use them on the items I don't frame and they fit nicely one behind the other so you have kind what you are talking about!  Good luck!!!

 

~ Chiz  

I would think that a art portfolio would be great for that.  They don't cost much and you can get them at most art stores.  They come in many sizes, 8.5x11, 11x17, and larger.

 

The portfolio is like a large photobook, with soft plastic covers and plastic pockets inside.  The front usually has a full size pocket as well so you can make a sign for each portfolio to catigorize the items. 

 

You can also put stickers on the plastic for pricing, and peal it off to change the price in accordance with the fair or show your selling in.