It is just to show value. DAA is worth WAY more than $10 or something....we just love throwing out insane deals. Get it FREE with Prodigy (Also on sale by itself) + FREE SHIPPIING (takes off $6.95). So, in reality, you get Prodigy for around $17 off, then you get a FREE D-Test, and once you apply the shipping coupon, you get them for ONLY $23.04. So, that is bascially D-Test matched with the other insanely low priced DAA caps on our site, along with Prodigy for ONLY like $12-13. You CANNOT beat that.
With Prodigy it's a great deal, by itself its a lot of money lol.