If you still want to try it, I got this one that went through one winter so far and is like new, making sure sharp stuff is isolated from cover. But I don't know what quality you will get for 200 to 300 bucks. At that price probably won't last more than a year. This is mine, Classic Accessories Sky Shield:
Mine was the smallest size, and it was 314 bucks last fall. Cheaper right now. Your size will be 445 bucks. It is incredibly well made, very happy with mine. Hoping it will last the 4 years it is warrantied for.