I would think CS- SIGN SUPPLY would be a good source. A merchant member here
I believe your two closest Roland distributors would be Midwest Sign Supply in Hayward and Denco Sales in Concord. I purchase my Roland printer parts from Midwest except for printhead which I used Solventinkjet.com (forum merchant menber). The parts drop ship directly from Roland (Irvine, CA) but you have to order them through a Roland dealer.
Midwest - http://www.midwestsign.com/
Denco - http://www.dencosales.com/
when sales people ask me to do their job for them.. I just hang up on them.. customer service people should be ashamed - glorified order takers who cant even take an order
Dont transfer me to your tech line so I can get the part number for you, ask me if I wouldnt mind holding so YOU can confirm the part number SMH