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https://motherboard.vice.com/en_us/article/nz73yz/counter-strike-gifting-steam-sale-cheating
its just in summer sale, now are available to gift it... look it in steam.
Right now u can purchase as a gift.
but no one is going to trade it for 3 keys outside a sale since it's $15 and you can't store it in the inventory
3 CSGO Keys
Csgo