I just upgraded the size of my brew kettles. Now I have two 15 gal Megapots to sell. I bought them here two years ago:
NORTHERN BREWER: Brew Kettles
They are drilled, you supply the weldless valve. Each have gallons marks on the outside in marker.
They list at $187, I'd take $150 if you pick up in LI NY. Otherwise, I have to figure out shipping costs. They are excellent pots and have served me well.
PM me if you are interested.