etc, etc.
A simple Google search on āsell your stlā would provide you with plenty of choices.
Word of caution though: read carefully each of their T&C and commissions rates before signing on as seller.
Donāt think there is one at this time, unless Bambu decides to create a specific section on their site, dedicated to selling such files. An alternative for you might be Printables, as on their restricted pay for access section, there are several makers who are selling their Bambu related files. On a few from those sites, the ones Iāve listed in my previous reply, there are several Bambu related files for sale, but you need to search for them.
You welcome. Itās the least I can do to help a firefighter in need. Good luck with the sale of your files. I would recommend you to āsacrificeā a couple or so from those stl files allowing free download in order to make yourself visible and the makes you create appealing to users (more so if these are parts of a larger package of stl files to be used to create a specific build).
See a couple of examples below, so that you get the idea: