What is an LG-PF2000 is the stand (legs and pedals) for the PF2000 keyboard. That beast is about 25 years old. An 88 key "piano" built on the DX7 ii sound engine. It even can use the same cartridges for additional sounds.
Based on what it is, how old it is, and the march of technology, my guess is that if you can find one, it should sell for $50 to $100. The current owner might want to sell for thousands though.
... after all it's big and heavy and says Yamaha on it.
If you're really looking for that specific model, spend time on eBay and Craigslist, one might pop up.