This seller has 2 mutes for sale:
Black Denis Wick practice mute, starting bid $20:
http://www.ebay.com/itm/Dennis-Wick-...-/121968744999
Denis Wick aluminum finish straight mute, starting bid $20, buy-it-now $40 (excellent buy!!):
http://www.ebay.com/itm/Dennis-Wick-...-/121968747473