You can find SL1200/1210mk2, mk3D, mk4 (with 78rpm), mk5 ... and SL1200 gold ltd ... They are all have the same sound with minor changes in functionality of the pitch contol, a little bit better wires etc, but it’s all based on mk2. Price for them in Japan today is about $150-350 (used) depends on condition, except the collectible gold ltd models and rare mk4 (which plays 78rpm as well). For this price you can’t buy a better DD turntable. In the rest of the world the price is about $400-500 (used) and still nice for those who needs a complete turntable. They made 3 000 000 units of the SL1200mkII. I wouldn’t buy them for $500, for about $1200 everyone can buy much better sp10mk2 or sp20 for about $700.
But the SL1200GR, G, GAE (coreless motor) is completely different beast, the lowest price for a brand new GR is about $1700? But the G is better for double price. You can read Steve Guttenberg’s review:
https://www.cnet.com/news/the-new-technics-sl-1200gr-turntable-for-djs-or-audiophiles-or-both/