One thing that helps kill retail stores is that they must charge sales tax and internet stores do not, as long as the customer is out of state.
On a large ticket item, this can be significant enough for them to lose the sale, despite all the benefits of buying locally.
Even if the retailer matches the on line price, he must add that 8 or so percent.
Of course the BUYER is responsible for paying the sales tax. And I'm certain all of us do that without fail.
DonM