I've been doing preparation research for a new SaaS product, and as a solo founder/designer/developer, I'm always looking for ways to save time and effort.
There are, of course, thousands of different boilerplates for parts of stacks, and some for full stacks, but hardly any for a complete functioning SaaS, including billing pages and functionality (think invoice receipts), account & team management, email notifications, etc. etc.—all the stuff you probably don't need to build yourself. I'm having an especially hard time finding something like that for a serverless React application (database as a service & lambdas instead of a traditional backend).
Do you use boilerplates for new products? Have you ever paid for one?