$850 to $1050 on ebay for new Force 1X: rear derailleur, two rim brake/shifter levers, battery and charger. The cassette, bottom bracket, crankset, brakes not included. Even so, I would bite if I could just buy the shifters, RD, and cassette w/o changing the wheel too.
I wonder if the movement of SRAMs rear derailleur is mechanically determined, or software programmable. Could they adjust the RD in software to move any amount? I.e. to move for 8 speed spacing, 9 speed, anything? Idle speculation, I guess. They probably wouldn't want to, even if they could. How are they going to sell XDr freehubs and licenses if anyone could just use put it on their existing bikes?
How do you like using Shimano style brifters? I've only used down tube shifters. Do you like having a brake lever that moves?