I discovered a little (OK really LARGE) termite problem in our back fence. I did some Googling to ID the exact pest, and the recommended solutions. The treatment seemed pretty straightforward.
They do not sell these treatments at your big box lumberyard place. Now the choice was to buy the stuff online, or go to my friendly, neighborhood DIY pest control place.
I'm all for supporting local business, and am also a bit impatient. I chose to visit Bug & Weed Mart, rather than wait around for an order to arrive.
As expected, I got friendly, helpful advice. As was also expected, the prices for the products were a bit higher than what was online. Of course, you are paying for the aforementioned friendly, helpful advice, plus their operating expenses, etc etc.
But -- yowza -- the prices were double what I found online! I went ahead and purchased there anyway, because, like I said, I'm impatient.
My friendly, helpful advice is, if you are patient, and fairly confident in what you are doing, and want to save money, you might be better off doing some Googling and ordering online.
If, on the other hand, you really have no clue, or just want to get the stuff fast, or want to keep it local, this is definitely the place to go.