REI Garage offers the Columbia Women's Fast Trek Hat in Red or Blue for $4.73. Choose in-store pickup to avoid the $5.99 shipping fee. That's a buck under our October mention and the lowest price we could find by $5 (outside of the seller below). It's available in sizes S/M or L/XL.

Note: With orders of $25 or more, Amazon offers select colors and sizes from $4.33 with free shipping.