I get it at Costco.
I saw pork belly's on the futures market were cheaper than since the 50's or something. Will bacon and belly's go down in price at retail? Pork belly's at Costco are the same price pretty much as cured bacon.
Most butcher shops can order it as well.
I got mine at Costco. This one was marked $2.99/lb, but it's been in my freezer for a year, literally. It was dated in mid-April 2019. I don't know what the prices are running now.