So the last thing my Raleigh Pro needs is brake cables. Brakes are older Campagnolo Record brakes. The boutique bike shop near me had Campagnolo labled cables but they looked thinner than I expected with black housing. Where do I get the old fashioned gray stuff? I'm not hung up on using Campy branded cables, just the correctly sized ones.

Boulder Bicycle has old style grey cable housing (unlined) and genuine Campy grey housing. The Campy housing is very expensive! Both Jagwire and Shimano have grey housing that looks OK.

Only buy Campy cables/housings when they are accidentally on sale.
Which is usually never.