Interesting Drug Prices

In a recent piece in Becker's Hospital Review they list the cities with the highest and lowest drug prices.

They note:

10 most expensive cities for medications
1. New York City — 20.10 percent above national average
2. San Francisco — 12.60 percent
3. Los Angeles — 9.80 percent
4. Philadelphia — 7.90 percent
5. San Diego — 6.40 percent
6. Raleigh, N.C. — 4.30 percent
7. Birmingham, Ala. —  3.90 percent
8. Orlando — 2.80 percent
9. Cleveland — 2.50 percent
10. Sacramento, Calif. — 2.20 percent

10 least expensive cities for medications
1. Columbus, Ohio — 21.70 percent below national average
2. Atlanta — 18.60 percent
3. Houston — 17.40 percent
4. Dallas — 16.90 percent
5. Denver — 16.30 percent
6. Salt Lake City — 11.00 percent
7. Indianapolis — 10.60 percent
8. Washington, D.C. — 10.60 percent
9. Las Vegas — 9.40 percent
10. Tampa, Fla. — 7.30 percent

That looks like a 42% swing! I know New York is expensive, in Manhattan, but all over the city?