Good luck on the 8148, I searched high & low for that one before just ordering a complete custom duplicate from Clark when is was operating.
Are you sure they aren't fixable? As long as there are no scratches or gouges in the label side, you can resurface them. Being you have the discs, fix them!
http://www.walmart.com/ip/14944781?wmls ... 32&veh=semI've had this machine for years, can turn a bad disc to almost new again! Same one a local video rental chain used for their DVD's as well.