Sam's Club sells a big ole pail (40 lbs) of something called Wind Fresh. I don't know if I am remembering correctly but I think is sells for under $10.00 and it works just fine. I have a front loading Maytag machine which I'm supposed to use the HE, but I can never find that in any of the stores, so just use less of the Wind Fresh, so I'm probably getting more than the 160 loads that are indicated on the pail. I don't think anything will beat that for being economical and like I said, it works well.