According to the sources provided, there is a significant cost difference between Lipitor and Pravastatin. Lipitor is a brand-name medication that is used to lower cholesterol levels in the blood, while Pravastatin is a generic medication that also lowers cholesterol levels.

As per [1], Lipitor's patent expired in 2011, and since then, several generic versions of the medication have become available. However, even with the availability of generic versions, Lipitor remains more expensive than Pravastatin.

According to [2], the average retail price of Lipitor is $342.28, while the average retail price of Pravastatin is $14.45. This means that Lipitor is approximately 24 times more expensive than Pravastatin.

Furthermore, [3] provides a comparison chart of statins' intensity and retail prices, where Lipitor is categorized as a high-intensity statin, while Pravastatin is categorized as a low-intensity statin. The chart shows that high-intensity statins are generally more expensive than low-intensity statins, which is consistent with the price difference between Lipitor and Pravastatin.

In conclusion, based on the sources provided, Lipitor is significantly more expensive than Pravastatin. The average retail price of Lipitor is approximately 24 times higher than the average retail price of Pravastatin. Therefore, patients who are looking for a more affordable option to lower their cholesterol levels may want to consider Pravastatin as a viable alternative to Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.singlecare.com/blog/pravastatin-vs-lipitor/
[3] https://www.goodrx.com/classes/statins/intensity-comparison-chart