Loyd, my coupon says “Get $20 of free testing plus an additional savings coupon.” For a 1/2-cup sample from one area of your yard, it’s free. If you want to test other areas, which is recommended, they’ll accept the additional samples at “a nominal charge.” Either way, it doesn’t sound expensive, and in return, your garden will bloom like Eden. (They didn’t say that, but I inferred it.)