they pop up on forums like regalgs.org or clubgp in the for sale section from time to time for around $75
but you can get a high quality new one from zzperformance for $100
dont pay summit or jegs $250 + for the slp one , i have used my zzp one many times and it is a good unit
they also rent them , you basically pay the full price up front then they refund you around 70% upon safe return of the puller kit