Currently these are the ones who will have vendor spaces in the Bronco 50th Midway area near the Bronco Pro-Builders tent and MEB/Bronco 50th hospitality tent.
BC Broncos
Bronco Design
Bronco Driver
Duff's
Shelton Mfg.
Tom's Bronco Parts
There will be some other vendors such as Dennis Carpenter set up in their regular spaces at the show as well.
NOTE: Some of these vendors do not bring orders to the show (Carpenter?), or are shipping their displays in and flying in (Tom's plan last I heard), so they may not offer free shipping either. Best to ask to be sure before planning on it.