Boston Acoustics part sources

I'm looking at replacing the woofage in the $36 pair of A150's I'm working on. I did a foam surround replacement, but the new foam is a little too restrictive. (The foam roll is smaller than the original.) I'll just eBay these drivers as refoams, so I can get some of my $$ back.

Other than the factory, which wants $60 each for the woofers, are there any known parts dealers online who might have these at a better price? Or, does anyone here have access to them at wholesale? I'll get them from Boston if I have to, but if I can save a few bucks I'll go another route. Generic replacements won't do--they're not matched to the cabinet volume or crossover.