Under Armour offers its Under Armour Men's CoolSwitch Compression Shirt in seven colors (Graphite pictured) for $20.24. (Amazon offers it in select options for about the same price with free shipping for Prime members.) Plus, coupon code "OCTFREESHIP" bags free shipping. That's $9 under our August mention and the lowest total price we could find by $2. It's available in sizes from S to 3XL, although not in all size/color combinations. Deal ends October 21.