Read it and weep. Some good ones on here
Kenwood does the same thing with their commercial radios, and much sooner than most of those old dinosaurs on the list.
Motorola, same thing, but often much more quickly.
There's not a lot of point or profit in stocking parts for old radios for eternity. At some point, they have got to cut the cord.
As for finding repair shops, check around in the ham community. You'll find guys that specialize in specific radios/brands and often will buy up parts stocks from old shops. If all you need is a radio cleaned up and aligned, there's tons of hams out there that would happily do that for you.
As for buying used….
Used amateur radios are a weird thing. I sold an old Kenwood TM-741 144/440/1200 radio last year. It had been sitting in a box my dad had for about 15 years, untouched. I powered it up, put it on my service monitor at work, and it checked out OK. I cleaned it up and put it on E-bay thinking I'd score $400 for my mom. Nope, that radio sold for about $750 after a pretty good bidding war.
Ham radio operators are a bit weird when it comes to used equipment. I've sold other used radios before and they've sold for more than what I paid for them new. I guess it's nostalgia or something, but it never ceases to amaze me.
I think the used market is pretty messed up right now. You might have better luck buying new.