My usual approach is to find the part number (say on parts.toyota.com) and then google for that number; various dealer (new) and salvage options will show up. -Chap
It's within the inverter? And if so, would it be available as a separate part? Not sure. Hybrid Components for 2011 Toyota Prius | Toyota Parts
Toyota Converter Kit Hybri 04899-47030 | GrahamToyotaParts I think this is the right part, is so it is about $450