Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. The patent for Lipitor expired in 2011, which means that generic versions of the drug are now available [1]. GoodRx is a website that provides information about drug prices and discounts, and it lists several pharmacies where generic atorvastatin can be purchased, including Walmart, CVS, Walgreens, and Kroger [2]. However, the price of generic atorvastatin can vary depending on the pharmacy and the location, so it is recommended to compare prices at different pharmacies before making a purchase. According to Reuters, Pfizer, the company that originally developed Lipitor, aims to keep one-third of the market share for atorvastatin by selling its own generic version of the drug, called Lipitor Authorized Generic [3]. However, this does not affect the availability of other generic versions of atorvastatin.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/lipitor
[3] https://www.reuters.com/article/us-lipitor/pfizer-aims-to-keep-one-third-of-lipitor-pie-idUSTRE7B008A20111201