There's an employee-owned Winco grocery store in Sacramento, as well as several others in neighboring towns. I buy 4-packs of Purina 5.5-oz cans for $1.59 each, which is $0.072/oz before tax. That's considerably less than the next best price and better than any other store I could find or anywhere on line.
Purina is another Nestle company, like Friskies and Fancy Feast, and ordinarily I'd be boycotting it; however, I have to go with the best price for this. I'm feeding three cats of my own plus three (and maybe more) neighborhood strays. Each cat gets 1/4 can every night, which is more like a treat than a meal, and they all have 24-hour access to a grain-free dry food.
If you have a Winco in the area, check it out. If you don't, you might check the discount/low-price grocery stores to see if any of them carry the Purina 4-packs.
Good luck! 
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