Where to get oil diverter plug

NAPA didn't have one, didn't seem interested in finding one. But the other "real" parts store in town had them. It is a 9/16" plug. I got two because I have no doubt I'll screw one up trying to install it.
As a side note, this store, an Auto Value store, gave my 3 y/o son a NASCAR Auto Value car while we were there...they have my business from now on. The Advance and Auto Zone store in town are a joke anyway.

Thanks.