I'm trying to remember the exact price, but I believe they were over $1000 each. If you can get new woofers for $100 each, those speakers are well worth it. Don't ruin them with a different driver, which won't fit properly into the hole, and the mounting screws won't line up. The sound of that speaker was big, detailed, and they had authority in the bass. They were natural, but on the flat side. Still, they were excellent. And, God, that rosewood!
BTW, if ou can scam some original B&O stands for those, they lean the speaker back a bit and time-align the drivers. It makes a big difference. B&O was one of the first companies to address baffle diffraction and time-alignment of drivers.