I did not know it at the time but bought mine from a Camping World store which is [owned by|owns|is associated with] the Good Sam club.
Go to
their locator to find a store near you (are quite a few near me).
They have interesting sales and flyers if you are on their email list and between them, Amazon, the web, and JD Saunders (TM dealer about 100 miles from here) I have found everything I need.
As mentioned most items are standard RV and unlike some things I deal with, most are able to supply replacement parts.