This "awesome price" deal imo has too many variables that could very quickly turn it into the worst deal ever.
I would only entertain the idea if i could guarantee my established animals were safe from any cross contamination that may occur.
Im assuming they have some kind of housing where they are now, see if the current owner will strike a deal, allowing you to house them separately from your current group. They probably will do a good deal on the current housing as they have no future use for them.
sent from my phone to the internet to your screen.