i got mine a year ago from stormer hobbies for $120. they are fantastic shocks and i haven't broken a single part. a good tip to keep the shafts completely clean is to cable tie the shock boot to the ball end (on the by-pass shocks) and run the boot between the spring retainer and ball end for the dual rate shocks.

you can't get the boots anymore, but i use duratrax warhead boots. they are $3 for a set of 4 and work very well. i use them on my hellfire and CRT as well (they just work on the CRT rear shocks...just)

get some spares though, since sticks love going through them.

also with your powerstrokes, change the shock oil very regulary, since parts are limited.

oh yeah, pro-line still makes the by-pass shocks which are the key part of the suspension system. then all you would need is a RC Raven dual rate spring on some standard shocks to get a similar ride.