I always ask “I presume you only have what’s on display but in case I’m wrong, do you have any other stuff”? (Mostly when I’m buying new shoes or a shirt, that’s pretty hard to find in my size). If they say they don’t, they don’t. Why would they lie to me, their purpose in the shop is to sell stuff.

THERE’S NO PRICE TAG ON THIS SO IT MUST BE FREE RIGHT HAR HAR HAR