NAMES has two kinds of displays- vendors and exhibitors.
Vendors pay (I think a couple hundred dollars) to have a table and are allowed to sell items. There are new items from places like Little Machine Shop.com, PM Research, Sherline, and lots of used tools, books, plans, casting kits etc. I think last year there were 30-40 such vendor tables.
Exhibitors are NOT allowed to sell anything, although some guys cheat and offer their models for sale. Exhibitors are supposed to just show their work. This rule is to prevent the show form becoming a flea market, and I strongly support it.
To allow exhibitors to sell a few items Cabin Fever runs a consignment area- you sign in your item, up to 10 max. They handle the sale, you go by later and collect your money. Its great and I always buy and sell a few items there. NAMES had a consignment area run by a model club for a couple years, but they have not had it for the last couple years- I think the club found it to hard to run.
NAMES may have a vendor list on their web site.
If you are thinking about just one show, Cabin Fever has 120,000 sq feet of 'stuff', NAMES has 30,000