The nappies from 'The Continence People' / 'The Washable Incontinence Shop' are similar to the ones from Snuggleblanks / Blankencare in that they have a large and stiff taping panel, the edge of this can dig into your legs a bit, but apart from that they feel nice and are nice to look at in the trendy grey colours. You're correct that everything is shown as out of stock - on 20/12/23 they posted on facebook that they had to temporarily suspend orders due to a family emergency and there has been no news since.
I use any old plastic pants from my random drawers full of them. I have pants from UK, France, Spain, Poland, Argentina etc but always pull-on for me. I never really bother with ABDL shops, I kind of like the naughtiness of buying stuff from normal shops and wearing for fun! I do wish I'd got round to trying Arizona though, that was a serious omission on my part. Also I had a pair from Hazel Jones which were great, wish I'd got more from there!