If you break down the prices, WOWA are as follows (no shipping, rough estimates). 70/12=$5.80/Ounce (36/4=$6.5 ouch), 29/6= $4.80, 24/8=$3. I bought the sampler back in Sept. and its quite nice, however, it certainly does not live up to the Ultima v. Zaino claims, which are quite comical.
Case in point, I will buy again when my 4oz runs out. I'm about 1.5 ounces through the bottle with at least 20 apps.
I don't know if you should compare at the price per ounce. Instead look at price per application. It sounds as if you only need a tiny amount of this stuff. Very concentrated I guess.