Walmart offers the Pure Garden Outdoor Umbrella Screen in Black, model no. 82-5677C, for $18.99. (Amazon offers it for the same price for Prime members.) Opt for Site-to-Store pickup to avoid the $4.97 shipping charge. That's $4 below our mention from last summer and the lowest price we could find by $3. It features a weighted bottom and fits most umbrellas up to 7.5 feet in diameter with its adjustable cinch top.