I used to work for a furniture vendor that sold to Costco. All of our shit was twice as expensive at Costco retail than elsewhere because of the return rate. Costco isn’t ripping you off, their markup isn’t high, but our wholesale to them was much higher than to other retailers to cover the returns. Ready to assemble furniture is basically disposed of when you return it, so total loss. Factor in a 40% return rate and you can do the math. I bet you can find equivalent to this way cheaper elsewhere. Up to you whether the ability to return it after two years of using it is worth the higher cost. More on reddit.com

They will only let you buy it if you have the kind of backyard views as in the product ad More on reddit.com

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They make covers that cover groups of furniture - I got one for my conversation set to avoid having to deal with six different covers. Just measure the whole set pushed together and you should be able to find one to cover it. More on reddit.com