fuel cell needed

i am looking for a fuel cell. it needs to be 16-20 gallon. it needs to have a metal can with a bladder (similar to most circle track cells). the only brands allowed by my series are RCI, ATL, JAZ, Fuel Safe or RJS. i know its limiting, but that is what we have to run. a new RCI 16 gal circle track cell runs $205. i would like to save as much as i can.

thanks
jim