Lipitor is a brand-name medication for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, which means that generic versions of atorvastatin are now available. The availability of generic atorvastatin has led to a significant decrease in the cost of the medication. In 2011, Pfizer, the manufacturer of Lipitor, aggressively pushed for the use of their authorized generic version of the drug [2]. The authorized generic version is chemically identical to Lipitor but is sold under a different name. This move by Pfizer was aimed at maintaining their market share for the drug. GoodRx [3] provides a list of pharmacies that offer atorvastatin at discounted prices. The prices for atorvastatin vary depending on the pharmacy and the location. It is advisable to compare prices at different pharmacies before making a purchase. In conclusion, the availability of generic atorvastatin has led to a significant decrease in the cost of the medication, and GoodRx provides a list of pharmacies that offer atorvastatin at discounted prices.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nytimes.com/2011/11/30/health/generic-lipitor-sets-off-an-aggressive-push-by-pfizer.html
[3] https://www.goodrx.com/atorvastatin/what-is