This DIY bulk speaker cable (8 awg @ $13.75/foot) available from GR Research (construction instructions here) appears remarkably similar to this bulk speaker cable ($4.05/foot) available from China, which is supposed to be similar to Kimber 12TC ($35.50/foot @ Partsconnexion).
Kimber 12TC is OFHC wire in Teflon, while the GR Research is apparently OFHC in polyethylene, and the Chinese version is advertised as OCC in Teflon. In any case, the Chinese cable provides a lot of copper for $4/foot in a weave that appears identical to 12TC, so if I were just starting out to build a system I would have no hesitation giving the Ali Express version of this cable a try, leaving me more money to spend on electronics and speakers.