In the initial scenario example, if I was new to the hobby I would probably just search for "bases for wargame figures" not being aware of the various options i.e. plastic, acrylic, mdf, plywood, metal or making your own as we all used to out of card. The question pre-supposes you know of the various options and have decided on mdf which would suggest you would probably know to go to Warbases rather than search for them.
During the first lockdown, Warbases shutdown for a period and then I believe I searched for "Mdf wargaming bases" and admittedly didn't have much success so I just waited until they were up and running again.