I go through a carto a day at least.. but I have 12 tanks all with different flavors that I rotate through out the day. So I keep 4 boxes of each SR/LR Boge's around. The local vape shop is only 10 minutes away so if I get down to a box I go get more. I would not mind ordering them online since these things are about .60 cents online and I pay $1.50 each local... Time to move on to a rebuildable!
I also rotate through about a dozen tanks, each with their own flavor. Obviously, the ones with the more favored flavors will get used the most, and need carto changes more frequently than the others. My only issue is, and I'm not complaining, is before I got the Provari, I was using 2.0 ohm cartos exclussively for my two 3.7v mods (a Silver Bullet and BB). But I am loving variable voltage so much, the Provari, which I'm loading with 3.0 ohm cartos, is getting at least 90% of my vaping attention. I'm progressively changing out all the 2.0 ohm cartos to 3.0 ohms for usage with the vv APV.
I had to buy a small hobby storage organizer with pull out drawers just to separate and organize just my cartos. 2.0 ohm single coils with one and two hole pre-punched. 3.0 ohm single coils with one and two hole pre-punched. A few 2.0 ohm Boge cartos I keep around for the couple of shorty tanks that I own.
Even though I had maybe a dozen Smoktek cartos already, I'd been wanting to try out some Ikenvape Platinum cartos for a long time, but they have been out of stock for a long time. When I got a tip recently that they were back in stock, I ordered a dozen of them.