I agree the big Orange stores are a ripoff and a pain to shop in besides. I had to buy some 1-1/2 emt compression connectors they were 3.69 each the supply house charges 1.33 each. Also their weatherproof stuff is high and their conduit bodies must be gold plated. They are only cheaper on the pipe and wire, and then just on the small wire.
The way they make money is advertise the main item cheap then sock it to you on everything you need to go with it.
I'd sure like to find better pricing on GFCI devices somewhere than $10 each.
Brian