Walmart offers the Ozark Trail Sun Wall in White or Light Grey, model no. FGA1010SWB, for $7.96. Opt for in-store pickup to dodge the $5.97 shipping charge. That's essentially tied with an expired mention in another color from three days ago as the best price we've seen. (It's a low now by $16.) It fits 10x10-foot straight leg gazebos and measures 114" x 74" x 60".

Update: The price for the white item has dropped to $7.51. Light grey is slightly higher at $8.40.