Have you tried looking at pawn shops for a T-40 case? When I got my T I didn't have a case so I found a Dyna Bass case for $10 at a pawn shop. The T didn't fit in there really well, so I got the box cutter out and did some mods to make it fit. That worked for a couple of years and then I found a proper Type 2 T-case at a pawn shop for $25 or so.
Are you talking about the ferrule on the back side of the body where the strings are anchored? If so, I think Stewart-McDonald guitar parts has some that should work.