okay i have had no luck with the issues with my rb67 back so I'm looking to send it somewhere for repair. Anyone have any recommendations?

Also I am getting worried - are the 120 backs disappearing off the market? Will I potentially have to sell the camera because of the back problem? Seems crazy! If anyone on this forum is hoarding 4 or more backs and is feeling generous/altruistic I'd be happy to buy one from you I love the camera and I want to keep making photos with it.