Just a quick google search finds this company:
http://www.commodorecomputercenter.com/amigahw.htmI've never heard of them before, but the list looks like it was recently updated? Huh. A bit steep at $36, I know there used to be a few other places that sold them (including several ebay stores), but just wanted to throw this out there. Might be worth a call if you don't have luck elsewhere?