I've talked to local salvage yards, and he said about $150 for the rear hubs.

if you're really itching for a donor car, del sol's and some 5th gen civics had rear discs, but those are a little smaller than the teg/si rear discs (or so I've heard)

bolting the hubs isn't too technical, however, you'll be running brake lines and an e-brake cable, plus you'll have to bleed the lines. that might be a little more advanced if you've never gotten under there and poked around.