What do you regret not buying when traveling?

what did you regret not buying when you saw the item in the mall or market while traveling?

i will start. this happened when i was visiting amesterdam.

I saw that perfume in a fancy store and thought to myself that i will buy it in the airport before i fly out so i don't have to carry it from the Hotel

I got to the airport and I COULD NOT FIND IT. i checked in all the stores.

the other thing is that the store does the tax refund at the store itself, so I wouldn't even have to wait in the airport tax free refund. i feel so regretful 😞

that perfume is a niche perfume and I cannot even find it where i live. double regretful 😞