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Alas 3dog, I have. Maybe I am not putting in the right subject matter, but I am finding little to answer what I am looking for

First question pretty well answered already.

Cape gun, was a name for side by side shotgun barrel and rifle barrel from early South Africa or used there. A drilling, ie a German word, is a three barrelled rifle/shotgun combination. Also no such thng as a two barrelled "drilling".

The reason "cape guns" might be cheaper than "dillings" is the cape guns are probably older rifles/shotguns, originak vintage guns, and often the rifle barrel is in an unattractive chambering/calibre, not in much demand nowdays. Often originally a black powder cartridge. Some makers still make modern "cape guns" eg I believe Heym does, Blaser etc. The drillings might be older or brand new.

How to find a really nice combination firearm/gun at a really good price?

Million dollar question ... got to get out there and look. The internet makes most sellers nowadays knowledgeable ... send me $10,000 and I will find you a really nice $4000 drilling or even cape gun ...