There are several different levels of Medigap plans identified by letters. Level F are the most expensive, but as you’d expect, have the most coverage. However, Level F is now only available for people who already have it. Level G pays the same as Level F but has a deductible. Other Levels pay different amounts. All policies within a level have to pay exactly the same. You can go to the Medicare website medicale.gov, enter you zip code and they will show you what’s available in your area.
There are also Medicare Advantage plans which cost much less per month but tie you into a particular healthcare system and act more like an HMO.
You can also get information, or at least find out where to get info by contacting a local senior center.
Good luck.
They sure make it hard to find good reliable information.