CVS currently has a deal on 8oz pistachios for $2.99 Thats $0.37 per oz. (Lightly Salted or Roasted and Salted) Deal good till 7/21
Technically no limit but YMMV as one store limited me to 6 but at another I bought 10 in one transaction.
I would encourage you to do in store purchase because it's free shipping after $50. I was not charged tax in CA.