There is currently a set of 7 Tama Mighty lugs for sale on eBay for $120 w/ free shipping. I spent years buying used Tama King Beat and 8056 "parts snare" off the net and rebuilding them into solid snares, that is definately the cheapest way to get parts for these drums but might not make sense if you need just one lug. I will say that I think it makes good sense that if you are going to be a long term owner of these snares to have a few replacement lugs on deck, they do fail with some regularity, even the Mighty lug which was designed as an improvement to the early Imperial lug.
Either way, I could use a few spare Mighty lugs myself so if you want to split this auction then I'm game or you could just buy them yourself and sell what you don't need individually to recoup your money. http://www.ebay.com/itm/7-lugs-for-vintage-Tama-Superstar-Kingbeat-6-5x14-snare-drum-VG-/152115653094?hash=item236acca9e6:g:vqwAAOSw9eVXUwEx