Price moves on the 100 most-prescribed generics at Cost Plus Drugs, Amazon Pharmacy, GoodRx, SingleCare, Walmart, Costco and the chains, discount card rule and fee changes, manufacturer copay card and patient assistance program changes, $4 list and membership program changes, mail-order and 90-day pricing, pharmacy benefit rules that block cards and state laws on pharmacist price disclosure, with the drug or program first and the cash price beside it.