Check Ebay on a regular basis, and welcome to the forum!
I got my '78 by accident, my GF was searching the internet and stumbled upon this pawn shop where they had one...just have to be a bit lucky one shows up.
Try a Classic Series Stingray when they are released in Jan, you'll have your 76 Ray only one that really works and a much better player & Lighter, Now if you want a Radio knob just to have one I can respect that,
One thing I would like to mention, on the 1976 Ray one big Problem was the Pickup, Magnets we're so long that they went into the body and became so strong it was too much pull on the strings which caused many problems, Just a Heads up if you consider one as a Player.
Good Luck.