I got a awsome deal on mine. It is a B+M 144 roots supercharger. Cost me $1360 shipped from Ontario. It took me about 2 days to get it on and running. Alot of that time was fabing some parts. I had to take the tensioner unit off and cut the bracket so the snout would clear the rest of the bracket. Re-routing the top rad hose was a task also. Basically it was not that hard of a job just a pain in the arse trying to overcome those few problems. Those blowers are $4200 shipped from Summit Racing.
It was used. I bought it from pal who decided to go fuel injection rather than carb in his 85 GT. I seen one in the Edmonton bargin finder for $3400. Ebay has had a couple and they go for about 1100 usd.