Hi folks! New member and first time poster
Hello and welcome to BGG
If you were asking a question about expansion availability, almost all are available but go out of stock often before coming back in stock after a variable amount of time. The print on demand, core and earlier deluxe/saga expansions/adventure packs tend to be out of stock the most often (along with the latest release).
The core can be found on a few sites at present. I tend to use Games Lore in the UK (both for price and availability) and monitor the recent restocks page if there are certain packs I am missing/looking for.
Hope that helps!