I work at costco. First of all membership fee is 45 dollars for a normal annual membership. If you own or manage a business, you can sign up for a business account for 45 dollars. Each level of membership allows a maximum of 2 people under each account, one primary and one secondary. Only with the exception of the business member, which you can add an additional 2 people for $35. High rollers who spend more than 3000 dollars a month usually get recommended to upgrade to the executive card which gives you a 2 percent return on every purchase at costco. It's not a whole lot, but im sure people would love the extra money.
Now for returns. You can return everything at costco ranging from used tampons (im not kidding) to grapes (must be at least half entact), and only with the exception of computers which is 6 months. I've seen people return expensive message chairs to dryers and washing machines from 5 years ago. When returning items, a receipt is necessary in order to get a refund back to however you paid it with. If not, store credit will be issued. Again costco has probably (in my opinion) one of the best return policies in the industry. You're probably wondering how costco makes money with all those returns. haha.
If your purchasing computer parts, costco would not be your option because you can find much cheaper stuff online.
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