[65Bowrider]

Try the Marine Connection Liquidators, 2970 US1, Ft. Pierce. They have racks full of plastic tanks, was $3-4 per gallon in all different sizes and dimensions. It was recommended we stay less than 50 gal due to no baffling system in them.
The place is full of marine supplies, but you have to know your pricing ... some of it's good, some not.

I believe them to be ok with ethenol when used with the proper hoses, but verity this.