I have 3 Contax 645s and a number of lenses, plus a Zoerk adapter to expand the lens range to include all Mamiya 645 manual focus glass (and their auto bellows) which helps to increase the number of occasions that the 645 can be the camera of first choice. Add in two digital backs and the kit is fit for the 21st Century. BUT it is a risky option for a new buyer as the system is no longer supported. If you have a problem, it is very hard to find a repairer and so professional photographers will avoid the C645; this has tended to depress the prices of the cameras. It has always been an expensive option for the amateur, largely because of the cost of Zeiss glass but as more Pros sell their kits, prices are starting to drop.. If you are determined to sell your gear, Ebay (and catawiki.com if you are in Europe) is probably your best opportunity as it tends to be the first place people look at and as a consequence sets the market price. Whatever you decide on, do NOT list them as a single lot - you will get a very poor financial reward. The 2 lenses that don't get good prices are the 140mm and 210mm; the top-selling ones are the 35mm, 80mm, 120mm, 350mm and 45-90mm. The Waist Level Finder sells for a very high price as do the 120 film inserts. It will be interesting to see if the FUJI GFX gains in popularity as it can offer a new outlet for the C645 lenses via the Fringer AF Adapter. I often use the Zeiss 80mm on the GFX 50S - if enough people start to use the GFX range, the prices for C645 Zeiss lenses may start to increase again. Why are you selling your gear?