So, for 15 Gal Stainless, we have:
~$150+/- for Brewers Hardware Sanke Converter and keg
~$200 for 15 Gal Corny - no bottom dump, fully pressurizable
~$410 for 14.5 Gal Chinese imported stainless w/ Tri-Clamps
~$450 for 15 Gal Sanke convertion with bottom dump, fully pressurizable
~$700 for 14.5 Gal Fancy Pants Conical Fermenters from whoever and more $ for tri-clamps and casters. Not pressurizable except to racking pressures (3 or 4 PSI).