What are you looking for in particular, Brian? I tend to use big box farm stores, (and Northern tool and hydraulic)as an idea generation source, or reference to see what's available. Then I begin shopping price, including online and from suppliers to my business. I usually get the best deal this way, but certainly not always. I'm actually working on a project right now that's unfamiliar to me, and spent the morning walking the aisles getting ideas. Then I made a couple purchases at my local mom and pop farm stores....they were the same price as the big guys.
Now if Northern tool and TSC had a foundry and could pour cast iron, I might seek their help for the next stage of the project.
My favorite item of illustration is a gallon of Cutrine Plus. TSC has it everyday for $59.99 a gallon, while Rural King has it for $34.99. $25 bucks a gallon higher?? For the same product??
"The stuff you need out here"..... Not at that price.