Bands

• Black Red Yellow - Pearl Jam poster collectors message board
• PhishPosters.com - Phish poster collectors message board

General posters

• Gigposters.com - Gigposters. All encompassing site for concert prints and comments/discussion.

Retailers

• Art Minion
• ConcertPosterArt.com
• Newbury Comics
• PhilaArts.com
• Poster Planet
• Poster Pop
• Poster Treasures
• Richard Goodall Gallery
• Sixties Posters
  
• Temple Ball Gallery
  
• Walnut Street Gallery
  
• Wolfgang's Vault