jegsar wrote:He is a chaos terminator so he buys it at the price listed under the options instead of the wargear.
This is incorrect in every way. The Terminator Champion has a distinct statline (technically) and thus is NOT technically a Chaos Terminator. It specifies only Chaos Terminators may purchase the fist at the lower price. The Champion explicitly selects only from the Terminator wargear list. Note the difference in language between the options like 7 point fists and the icons. The Icon says 'any model' and this means that either the Chaos Terminators or the Terminator Champion may take it. However, where it says Chaos Terminator, this excludes the champion. This language is present for 7 point power fists.