If you're looking for a new disco or don't want to deal with a used one, this one seems to be the lowest priced one available. I can't vouch for the quality or the company as i don't have any experience with them but seems legit. Free shipping too.
http://www.ebay.com/itm/161509948512?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
http://www.ebay.com/itm/161509948512?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649