I just picked up a bunch of 6.25 lb boxes of 6.4% phosphorus Cascade Complete at $5/box, at a local discount grocery store. That works out to $.80/lb. Also picked up a few boxes of 4.68 lb Cascade with Bleach (no doubt, an oxygen bleach) for $4/box. That works out to about $.86/lb. They also had phosphated Cascade Complete actionpak gel packs, 20 for $3. That actually compares well with the $17/85 pac tubs I've been getting at Costco. Would have to get my old receipts to figure out how much the older phosphated Cascade powder was costing me at Costco per lb.
Big Lots had the phosphated Cascade with Bleach, 4.68 lb, for $6/box. I passed on that. The only phosphated dw detergent I found at the 99 cents store was 9 gelpacs for $1. Not bad, actually, since that is the cheapest, but I wasn't sure of the brand. I passed on that also.
Anyway, I'm fixed for phosphated dw detergent for a while, between the stuff I bought today and the sacks of STPP in storage...
Hopefully in due course, when enough consumers reject the new phosphate free Cascade, we'll be seeing the "green" versions wind up at the discount lots shops, and a good phosphated version will return to the mainstream store shelves.