Looking for 8-3/4 suregrip rear for my A-body

Hey guys,

Im from ontario and I am looking for a 8-3/4 suregrip rear for my 71 scamp...i've seen some going for about $700 US....is this the going rate for one of these rite now? If anyone has a rear for sale or knows where i can get one for a good deal, then please let me know...i know national moparts stocks rearends, but im not sure on the cost for them...
thanks canadian brothers8)