How to Make Homemade Bitters
thekitchn.com
thekitchn.com
Unlike things like home distilling/brewing/winemaking its fairly easy to get to a point where the output is both cheaper and as good a quality as commercial offerings.
[edit] My favorite recipe from last year: https://www.chowhound.com/recipes/sunshine-bitters-11279
I can buy 50% vodka fairly easily, but here the 96% neutral alcohol seems only to be available through specialist liquor stores, with inconvenient prices and delivery.
There are also bitters recipes that use whiskeys that are quite good as well.
Things like homemade bitters are in the more feasible range for most people.