Walmart offers the Allen Sports Unisex Urban 1-Speed Aluminum Folding Bicycle in Red for $169 with free shipping. That's $10 below our mention from three weeks ago and the lowest price we've seen. (Outside of the seller below, it's the best deal now by $331.) It features glede alloy rims and 20" wheels.
Don't like red? Amazon offers it in Blue for $179 with free shipping. However, it's expected to ship in one to two months.