I try to keep 4 at a time. Normally in one of my drawers under my clothes I live at home with my parents (it's cheaper and housing is extremely expensive in NZ, and that's with me on a good wage and probably more money than I know what to do with!) so I tend to buy sample packs as a big box would maybe raise eyebrows. I buy up to maybe 2 sample packs a week (4 diapers in total, though I tend to maybe go through 3 a week unless I have weeks where I don't wear at all, and it's always at night time/bed time I wear, never during the day). While it may sound conspicuous, I'm always buying various things online so I'm regularly getting various packages in the mail weekly so it's not odd, plus i'm lucky that i've got family that's very respectful of privacy, and also relatively open minded, though I definitely keep this to myself and wouldn't dare share it.
The general ones I have are the NZ made 'Southern Star Adult Diapers'. Plain white with plastic landing zone and supergrip refastenable tapes (with blue tip) I've also tried the Abena Abri-Form but unfortunately they are cloth backed here in NZ, so I didn't bother with more, they felt too damp. I have since order a sample pack of the Bambino Classico (always wanted to try them, they were the first ABDL ones I ever saw on the net) and the Crinklz Original.