$400 to emulate what Brookses do naturally. There is a $300 version, without carbon rails, and in both cases they buy back the heater once you are done with it for $50.

I've got this issue wherein my 10 year old perfect Brooks saddle, now that I have lost 20 lbs and gotten older, just isn't as comfortable. Maybe I just need to suck it up and break in a new one (I've already purchased a new Swallow).