If the one you have works ok, not plugged/cracked, and you're just looking for something near new, I can't help much. I don't recall seeing one that leaked, just different degrees of stains/gunk. If yours is totally junked up and won't respond to cleaning, I might have something in better shape.
I toyed with the idea of using a late model tank, but it seemed to be more trouble than it was worth, starting with the tube on the neck needing to be on the other side to sit/look right.
PM me if you're interested.
Ken