Same here. I wear cloth and buy them online because that's the only place I can find them. If they were available locally I'd buy them locally as long as it wasn't a medical supply company. Years ago I went into one of those and bought a big box of "Disposable Adult Diapers." That's all it said on the box. This was 1981--years before you ever was adult incontinence products in the stores. (And for the record, "Disposable Adult Diapers" were horrible--flat, thin, and rectangular with bad tape. After wearing a few I ended up using them for "changing pads" under my cloth ones.)
Anyway I went in there, I was about 22 at the time, asked the sales guy for them and he kept asking me for my insurance information. I didn't want to have them billed to insurance because--technically--there was nothing wrong with me. But back then I was too scared to just come right out and tell the guy "There's nothing wrong with me, I JUST LOVE WEARING DIAPERS!" Finally he did let me pay cash but kept shaking his head and telling me "I don't know why you want to pay for these if your insurance would cover them."
But if there were some ABDL themed store--at this point in life with me older and really not caring anymore--I'd go in there to buy diapers while wearing diapers. That would be a rush, for sure.
I did once go into a drug store while wearing thick wet diapers under my shorts to buy some diaper pins. I got up to the check-out and the cashier (an attractive 40-something woman) rang them up, looked at me, smiled, and said "Well THOSE oughta hold 'em up!" I started to pull my shorts down, look at her, and say "Thanks, because they're about to fall down right now!" This was about 20 years ago and I was still too shy to do that sort of thing. I think if it happened again now, I'd do it. LOL.