if you still have the old woofer, have it rebuilt. There are a number of shops that will do it. Short of finding a cherry one cheap on ebay, you may not do better $-wise anywhere.
Allison One : woofer replacement
Need some advice as to where I might find a compatable replacement for the woofers in an original set of Allison One speakers (patent pending, must be early '70s.) Not sure of the specs but looking for something that is reasonably affordable, the right fit, and as close to the specs as is possible for a proper sound match. I've got three out of four that still keep on kicking but one has this obnoxious buzz. They just come along to rarely on eBay anymore. Thanx