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I used carcovers.com for mine. They have a lot to choose from (indoor and outdoor) at good prices and quality and they guarantee them all. My outdoor cover developed a tear after a year. I e-mailed them a picture and they sent me a new cover right away.
I had a lightweight cotton indoor cover for a while, but dust would always end up under the cover. That created the potential for grinding the dust into the paint while removing the cover. I bought a car duster and forgot about the indoor cover.
I should say that I am in an EXTREMELY dusty environment and you may not have any of these issues. This is a typical summer dust storm in my area and when this happens a lot of dust blows past the garage doors.