Where to purchase cables?

I'm another who utilizes the Cable Company.

It’s become my default approach.

I've found someone there I trust and I always work with him.

Thank you all again for your thoughtful suggestions!

What have you ended up with? Or are you still searching cables?

The lowest price to performance ratio is from on-line cable makers keeping down costs by not charging and passing along dealer and distributor markups. 
Sometimes you can find top quality gear from small custom shops who do not do much advertising - costs which are passed to the buyer.
One interconnect maker of pure silver cables which makes some of the best money can buy - and they are not crazy expensive is at
silversolids.com

For speaker cables, I’m using Zu Audio’s cheapest line. There really is a discernible difference. For interconnects, I use an eBay item labeled “McIntosh Silver plated shielded hifi rca audio line bla bla. They have no affiliation to the US Company, they are inexpensive, but on close inspection, these are incredibly well made. These use top grade shielded two Pair wire.