The full-chrome finish was a $50 option on a then-$230 bike--pretty significant price bump. It's over ($1000 total for the bike) in today's money.
As a recent purchaser, restorer, and resto-mod'er (aka newer components) of an all-chrome 1977 SLT 12.2, $185 (if the bike is in decent shape) is a great price and the bike is a great ride. Smooth, stable, comfortable, and as swift as you wish. I'm pretty over the moon with mine.
Welcome, the both of you. Can't wait to see some pics of your rides if you get 'em.