I have 84-up G-body ones, but they don't technically work as the wiring is different. I don't know exactly how, but...
Found one. But dig deep.
This new old stock steering column ombination headlight, dimmer, wiper? switch with pivot was manufactured by General Motors for use on the following models: Buick 1982 – 1983 Century (A) with Tilt Wheel (N33), Pulse Wiper (CD4), Buick 1982 – 1983
LeSabre, Electra, Riviera (B, C, E) with Tilt...
www.oldsobsolete.com
You will be searching for part number 7837280, or ACDelco # D6258A. You are right. It seems like the supply just dried right up.
And if you think 225 is pricey, you should see what sold on ebay recently. 240 and 405. So there's that.
82-83 Camaro/Firebird with tilt and delay use the same switch part number. As well as 81 Toro, and 82-83 A-body FWD. Also some 84-87 B-bodies. Gotta have tilt and delay, though.
I'm thinking out of the box here, but if the head piece is the same, perhaps you could re-arrange wiring from a newer switch 7843683. The wiring colors are different, but I don't know the matchup of the 82-83 to the 84-up.
Good luck.