Of course the $1/week is an average, but yes, a few large items have been purchased . Living in a rural area where selection is limited, means Amazon often wins over a 30-50 mile round trip. I get a ton of stuff from them, so I may not be a typical case.
I remember when it was the Sears Catalog. I used to get it twice a year, and that was how we in the rural areas got stuff not available locally. I don't think they even publish the big catalog any more. There was at least one episode of Cheers where Cliff comes into the bar all bent over with a sore back, and Norm asks "The Sears catalog come out today?" Of course, once upon a time the Sears catalog did double duty. But I didn't move out of the city until indoor plumbing came along.
I once bought a wood-burning stove through the Sears catalog. And the homeless shelter I worked at for five years was originally built as a Sears catalog house: All the lumber and hardware and everything shipped out by rail and assembled on site, though I don't know if Sears furnished the labor, or the buyers did. Yep, you could buy a house from Sears. Assembly required.
Maybe I'll take another look at what charities are now listed on Amazon Smile, though for my $4/year it hardly matters.