Hi Hawk - Ok, great question.
An example of subscription services that works for communities is - Linkedin see att. header "Try Premium for Free" (logged-in). You could use this example for UX mastery. For example you could include a similar CTA on the header for UX Mastery “Try Gold for Free” if that's the route you are thinking about.
From a UX angle it could be improved depending on the user flow and business objectives, but it’s a good example of how you could introduce it to a community.
An example of Pricing plans when you click on "Try Premium for Free” Linkedin is:
→ https://www.linkedin.com/premium/products?trk=nav_responsive_sub_nav_upgrade (once you click on a plan it is fairly complex with tonnes of text to read - this could be improved but you can start to see the user flow involved)
For ecommerce here are a couple of best examples that I know of:
→ https://www.bigcartel.com/signup/ (clear value proposition and very easy to use and get started)
→ https://www.shopify.com/pricing (ditto)
I hope that helps you?
Let me know, thanks.