Same as most other places. A single 18 wheeler can transport 60,000+ lb of stuff. Which is more than most small town grocery store. As to buying and selling these are cheap to ship and there are probably several wholesaler's in town.

Don't forget they can still order stuff from Amazon it's not in Antarctica or something.

PA: Australia is somewhat famious for using road trains due to the how much stuff they ship to remote areas. https://en.m.wikipedia.org/wiki/Road_train