We can also turn a post here into a “wiki” that anyone can edit, so that people can just add their data into the wiki here. The easier and more obvious you can make the tracking/posting process the more likely people will do it. The issue with these types of efforts is always “participation”. Its really hard to get people to participate in an ongoing way.
Here, for example, is a page / post that I created as a wiki for people to update pricing info… of course, nobody uses it 
Rapamycin (& Other Longevity Drug) Pricing Quotes Wiki
Anyone can click “Edit” on that first post, and add their data.