sources for DIY speaker cables

https://www.performanceaudio.com

Mogami, Canare, connectors, etc.

VH Pusar here... 

Serious AWG OFC....

https://www.parts-express.com/Mogami-W3104-1-ft.-Superflexible-High-Definition-4-x-12-AWG-103-1026?quantity=1

Chris has better copper....

https://www.vhaudio.com/wire.html

Canada really good...

https://partsconnexion.com

@ghdprentice 

2008 Stereophile just for fun they added some wire they bought from Home Depot... a 10 guage 3 conductor extension cord.

It was a 14-3 extension cord...orange with a black stripe.  I have a pair somewhere.

@artemus_5... Yes, in very tasteful orange and black. I must have got the 10 from what is currently recommended for direct lines. I remember looking a lot for the thicker gauge... most were I guess 16?

I took a quick search on Home Depot... There are lots of 12/3 and 10/3 extension cords available. Worth a try for those doing DIY.