Converter can run $100+ and it only works for Japanese games on USA console, Japanese console needs to be modded to run USA games.
Region switch can be had for less than $20 if you're capable of modding yourself. OBEY mod is $16 and quite easy to use.
8p2t switch is fairly hard to find nowday. Under $20, I can only find large and fugly rotary switch that won't fit inside any TG-16, PCE, CGFx, and Duo. The smaller 8p2t switch that is not rotary starts at $25.