Prices are 20-30% lower than in duty free, but some famous global brands will cost about the same. I bought whiskey (medium quality) 1l. for 30 dirhams - 750 rub, in Russia the same 0.7l bottle will cost 3800 RUB. (You can't write the name, the moderators delete it). There are also nice promotions. The only downside is that there are very long queues of migrants (Indians, Pakistanis, Africans), you have to wait even outside the store until it resolves. If you decide to go there or go, then be sure to take a passport with you.
For Dubai, it is a normal store. You can not buy in dyutik, but buy everything here. Prices are even lower!!! Beer, took five brands (the most famous) is very good. For our money 200 rubles for about 0.5. Whiskey liter 4400 for "Black Label". Indian rum, also good.
In general, do not take it with you, go to the store.
There are not many options to buy alcohol in the UAE, so thank you for that. But the price... Very very very expensive, and alcohol is very similar to palenque(