LA Police Gear offers the Elbeco Unisex V1 Wool External Vest Carrier in Navy for $9.99. Coupon code "NRA" cuts it to $9.49. With about $6 for shipping, that's tied with our May mention and the lowest total price we could find now by $67. It's available in short, regular, and long sizes from XS to 3XL, although not in all length/size combinations.
Note that stock is limited in many sizes.