Can you purchase a costco gift card for a gift.to a friend..? And can they make purchases with the gift card without having A membership ??

You can do a Trial Membership which is good for one day & if you have a Gift Card that would be the day to use your gift Card. However, before purchasing a Gift Card for a Non-Member, the Member should verify this information for the person who will be receiving the card to be on the safe side.💋🍀

Must be member to use Costco cash cards, the pharmacy is their only non member service

They can use a gift card if they get a temporary membership, I have not checked recently, But you used to be able to get a day pass to shop on a trial

Yes to purchasing a gift card. You can do it at the cashier. I think you still need a membership (with the exception of getting gas), but I'm not completely sure.