I'm going to be putting in the passenger side seat support soon and am going to need some seam sealer. I found one tube at the local Auto Zone, but it was 8 bucks. As you may know, I'll need WAY more than one tube. Is there something out there that is basically the same thing, but not called "Automotive Seam Sealer?" Maybe something labeled as Bobs Roof Paste or something?

Later,
Zappa1

I used a brush-on product I bought from Eastwood. I was pleased with the results. I can't recall the name, but I'm sure a search of their site will produce what you are looking for.

Paint supply houses carry it in full size caulk gun tubes for about the same price.