You're not going to be able to find a shop that will re-seal without installing new glass. They just don't do it unless you're willing to pay about 3x their usual replacement fee.
If you just want it to be sealed against air and don't care about the strength of the seal, remove the interior trim and lay a bead of silicone caulk from Lowe's around the edge of the glass and the metal frame of the hatch.
1996 Firebird 3800 Series II, T5 swap RIP 3-31-11
It lives on: Engine and trans from ^ are now in v
1996 Firebird 3800 Series II, T5