best DIY power cord?

I know there are tons of threads on this subject but in the world of audio new and better is just around the corner.

Best, in my opinion, means I am looking for easy to buy (maybe from one source), good sound (I am looking for an improvement over stock - not the best you can buy) and cheapest - a final price of $50 per cord is reasonable I think.

Am I dreaming?

Are there kits available?

thank you
Phil