I'm not endorsing these but my wife took me shopping at Ikea for the first time last week. We went thru the "as is" section and I bought two outdoor furniture covers one for $20 and a smaller for $15. The larger covered my 4000 nicely and the smaller covered my 8n nicely. Don't know how long they'll last, they have elastic around the edges and a plastic lining on the inside. They are called tostero, I think I got the largest and the medium sizes.