Fair price for an 8 3/4 housing with axels?

I've bought 3 complete A body 8.75 rear ends in the last 5 years. Cheapest was $150 and never paid more than $400. But, I've seen them go for $800. It's worth what you are willing to pay compared to what the seller wants. And if you are pleased with the deal, go for it and don't worry too much about what others have paid or gotten.