Many of us have pretty good google sleuthing skills and can find stuff...
It especially helps if you can find pictures of what you want, but a lot of us recommend Missing Fabrics website.
https://www.missingfabrics.com/
There are some shop people who respond, and there are people like me with significant stashes but willing to share. I've connected many people over the years with needed fabric.
edit/ps -- I am able to easily find yardage/FQs here and there, maybe not so convenient as the charm pack but if the heart wants the stash can usually absorb!