Check my math- I have to look more closely, but if I have a combo pack (set of 5 16 oz conditioners) of 5 scents, each 16 oz, that is 80 oz for a total of 94 dollars which included shipping. 94 dollars divided by 80 oz is 1.18 an oz.
1 Gal = 128 oz. So 177 plus at least 15 for tax sh so lets round up to 200 dollars for 128 oz. 200 dollars divided by 128 oz equals 1.56 per oz.
But 32 oz (single flavor) for 50 plus tax and sh, lets say at least 56 dollars. 56 divided by 32 is 1.75 oz
And even worse is 16 oz single flavor for 29 plus tax +sh say 35 and that is more like 2.19 oz.
So if you like a variety of Wen, then getting a combo pack may be best. But if you only like one or maybe two flavors, then the gallon. The gallon also probably is most efficient to use up completely, too. I've found that now that I use just Wen, I don't need as much to maintain.