Optimum Nutrition Performance Whey Isolate Protein - 4.19 lbs (Chocolate) or 4.5 lbs (Vanilla) - $34.99 plus $1.99 shipping if ordered online - Costco $36.98
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Just received the Costco ad today in the mail and saw that, valid from 3/15/2018 to 4/8/2018, they will have Optimum Nutrition Performance Whey Isolate Protein (not regular Performance Whey, but Isolate) for $34.99. This is discounted from their usual price of $49.99. See attached picture of their ad.
Maybe your local Costco store still carries this, but mine doesn't (I live in California). If you have to order online, it is $1.99 shipping. This product is already online for $34.99 right now, and can be ordered immediately.
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