Hmm... really? Well, not finding one on eBay isn't surprising, since I looked there a couple days ago and didn't see any tanks. However, you not finding one by checking car-part.com does surprise me, as I found quite a few the other day. Maybe I entered the wrong info or something. Sorry that you couldn't find one.

Have you tried taking it to a welding shop, or calling one, and seeing if they could repair your gas tank? Welding up some leaking seams doesn't sound like too difficult of a job to do.

Anyway, good luck to you. I hope you get it fixed soon (and cheaply).