I used to stock up but when I moved, I gave up a lot of my storage (downsized for retirement). Plus, I found that I like to try different brands and have some fun catching a sale every now ant then. I got some B&B from Ace when it was on sale earlier this year. I stopped and got a couple bags of Rockwood lump near St. Louis when I took a trip to see my dad. I have a bag of Stubbs briquettes because I like those to start my minion cooks.
I'm pretty much a lump person and since I don't cook (or eat) as much as I used to, I'm good with a few bags on hand. Though, I always have an eye out for something new, with a good review and especially if it's on sale. I'm not likely to get down to one (my last) bag unless something really significant happens to the supply. Last I checked, they make enough here in the US so I don't think the current situation is going to be a significant event for charcoal purchases, though I'd probably do well to get an extra bag or so soon.