I agree, practically every part for the CR-10 series of printers is available on line.
From power supplies to control boards, I have found every part I have ever looked for and they are usually very inexpensive.
As far as new printers I have been looking at the new CR-10 V2 and V3 printers as my next printer, they have improved the CR-10, added some new features and the price is lower than what I paid for my CR-10S two years ago. The big difference between the V2 and V3 is the V3 has a Titan direct drive and I believe a V6 hot end.
Steve