where would you say the cheapest source is, if you're down to share. For me fragrance carts benefit is having more options and easier to browse than mustafa. I've been to mustafa multiple times and kinda struggled to navigate the two sections.
No one particular seller or shop that is absolutely the cheapest. Thats where doing your homework by comparing prices comes in.
Carousell is a minefield. Too many fakes and too good to be true "deals". Not worth the time and effort trying to filter and find the legit sellers. But if you have to know, i ever purchased tester bottles from Scentman and Seoul look and the product i received are legit.
For Mustafa, there are some "buy 2 or 3 bottles" deals where you get 5-10% off the total price but they strictly don't allow mixing even from same brand same line so you end up with 2 or 3 bottles of the exact same perfume. Otherwise, single bottle prices are okay-ish.
Other brick and mortar shops worth considering: Beauty Language, Jasina. Perfume Bar.
Tins and Bottles have both physical shop and they also operate online on shopee. Momolove is another seller on shopee. Generally, i would say shopee prices can be some of the cheapest if you able combine vouchers, shopee coins, credit card rebate, shopback cashback and whatnot.