I purchased a couple of RB67 items on KEH three years ago this month, the backs have gone up a lot since I bought mine, I paid $84 for a 120 Pro SD back, now $134. I also got a ProS body for $76, has gone down to $72. I also got a 65mm f4.5 for $122 in good bargain condition on eBay, selling now on KEH for $189. Also, a 180mm on eBay three years ago was $91 in good bargain condition, it is now $119 at KEH. I understand that the last two are apples vs oranges but still I am not seeing evidence of price drops over the last three years.