I buy the Costco Kirkland Brand powder and that's $14.69 for 200 washes but you can stretch it to 400 washes if you just use 1/2 the amount per load. So that works out to $0.0367 cents per load and the homemade one I think is $0.05 per load. I don't see much savings and less work to buy the Costco one
I will start using vinegar for fabric softener though, thanks