Several companies manufacture generic versions of Lipitor, which is the brand name for atorvastatin, an HMG-CoA reductase inhibitor used to lower cholesterol levels. According to DrugPatentWatch.com [1], some of the manufacturers of atorvastatin generics include:

* Aurobindo Pharma [2], which is a global pharmaceutical company with operations in over 100 countries.
* Mylan [3], which is a US-based pharmaceutical company that offers a range of generic medications, including atorvastatin.
* Teva Pharmaceuticals [4], which is a multinational pharmaceutical company that manufactures a range of generic medications, including atorvastatin.
* Torrent Pharmaceuticals [5], which is an Indian multinational pharmaceutical company that offers a range of generic medications, including atorvastatin.

These medications are typically sold by online pharmacies and retailers such as Walmart, CVS, and Walgreens, as well as through online generic pharmacies like Amazon and others.

It is essential to verify the legitimacy of any online pharmacy to ensure that you are purchasing authentic medications from a reputable source.

[1] DrugPatentWatch.com - Atorvastatin (Lipitor)
[2] Aurobindo Pharma - About Us
[3] Mylan - Atorvastatin
[4] Teva Pharmaceuticals - Atorvastatin
[5] Torrent Pharmaceuticals - Atorvastatin

Sources:

1. [1] DrugPatentWatch.com - Atorvastatin (Lipitor)
2. [2] Aurobindo Pharma - About Us
3. [3] Mylan - Atorvastatin
4. [4] Teva Pharmaceuticals - Atorvastatin
5. [5] Torrent Pharmaceuticals - Atorvastatin