Thank you, SMT!
That is pretty much what I was thinking.
A couple of others that I was wondering about are Purilum and Real Flavors. Purilum is inexpensive but I don't know their timeline offhand. I don't know much about Real Flavors at all.
I'll have to dig a little bit to be sure, but out of the "Big Three" I believe Cap is the only one with discontinued chocolate flavors from that period.