Try local Craigslist. There are a large number of Bozak fans and they will jump on a pair.
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There are avid collectors out there. Stereophile reviewed a pair of B410s in 2005. Their online review includes J. Gordon Holt's take on the B-310 in 1966.
If you check vintage audio forums, eBay, and Craigslist(s) around the country, you'll probably get a better idea of the activity around these speakers, going rates, and feasibility to ship.
That's the best reason I've heard to add on a room in the form of a vintage man cave. Continue to drive it with McIntosh equipment, put a nice plush area rug on the hardwood floor and don't forget the leather upholstered overstuffed furniture. Accessorize with hand carved pipes and single malt scotch.