Just started my membership today from being a long time Costco member. Now I have both memberships in case the other doesn't have better sales in what I need. Although, I find it more convenient using a Sam's Clin membership. They accept all types of credit cards, debit cards, and even EBT cards. WIC is not accepted here.
Sam's Club has way more locations across the vegas valley, when Costco only has 3 for the meantime. It has everything that I could look for when stocking up on supplies, essentials and groceries.
I signed up for a membership that only cost me $30 for the whole year and I was able to add another person to my account. This was very accommodating and affordable.