Budget High Current Power Cords

+1 for Ice age

I’m a big fan of Silnote Audio out of Roanoke, VA. They only sell direct and have unbeatable prices for the quality of their product. Couldn’t be happier with my purchases from them (power cables, XLR to XLR, RCA to XLR and optical to RCA interconnects). I’ve also only bought their entry level so far.

GR Research power cables. Really nice and cost around $375 depending on length. 

I use ice age audio 10awg for amp and 12 for preamp.

Take a look at vhaudio.com.  They sell premade cords and Chris has a Diy page to make your own where you save alot.
I made 2 Flavor 4 power cords and others.  His plugs are really nice but too pricey for me.  I order  Viborg solid copper with gold plating plugs on amazon and i couldn’t be happier.