I feel ya about the savings. Almost everything I buy is shopped around AliExpress, Amazon, eBay, Craigslist then local. The trick is figuring out if the physical stores are passing any of its wholesale bulk savings to you.
Usually, that’s a laughable assumption, but some things, like individual plumbing or electrical parts, just go to the big box (except for anything copper, it’s like half the price online).
Tractor Supply has a decent amount of items at margin. By that I mean, like 15%. Which is way more than most places.