I would be interested in purchasing one of these, as I already have one, but your asking price is sky high for what these usually go for! You have to also keep in mind that these MFW-15's all have amp failures at some point or another, and that there are no replacement amps available and also no way of fixing the broken amps. With the MFW-15's, it is not "if" the amp fails, but rather, "when" the amp fails, as they will all go at some time. The MFW-15 that I am running had its amp go out 2 weeks after I bought it, so what I did was solder the wires coming out of the driver onto the binding post, then I purchased a plate amp from Parts Express and built a custom enclosure for the amp and wired the amp to the binding post on the back of the sub. Worked out ok.
If you would be willing to lower your price, (by a lot), and ship a single sub, I would probably buy one from you, assuming that I would have to do some work on it. Let me know.