Most cost effective source for residential wire and conduit?

moparmarks said

120V 20 amp circuit 500' yes run #10. Why just 2 conductors? No ground? Really need 3 #10 wires. Don't pull 10/2 romex into 500' of conduit. Use #10 THHN. Stranded would be easier.
On this kind of stuff Lowes and Home Depot are usually just as cheap as the electrical supply houses.

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I agree with you, and that was My point. Only thing I can find more cost effective is what they refer to as "outdoor lighting wire" (only has 2 conductors) where as 10/2 is usually 3 conductors. Neutral, ground, and hot. May not be perfect in my lingo, as I Just a residential grade /diy guy. But that's my understanding. Like how A "8/3" wire is technically 4 total. Has 2 hots, for like a 220 plug. Then neutral, and a ground.

I'm sure you know everything above, I'm more stating it so someone can correct me if I'm completely wrong lol. I wire my own home projects, and 220 plugs and such. But 100% not an electrician.