Knight used to have auctions at their facility once in awhile, annually I think? That'd be the best bet if they still do it. Here's what their site offers though:
Realtree APG w/ thumbhole. Right hand, fits Disc Extreme
$179.99
Black thumbhole for .45 & .50 Disc and Disc Extreme
$138.99
Knight Rifles
(641)856-2626
Surely somebody here has a connection down there. You gotta think they have some with a little non-noticeable defect for a discount. A muzzy hunting friend of mine bought an entire DISC from them for dirt cheap at one of those auctions because the camo stock had a little tiny spot of white in it. Couldn't even tell.