Urgent* JX-3P & PG-200 info. requested *

I have a Roland Jx-3p without the pg-200 and I'm presently looking to buy the add-on. From what I've read, the pg-200 is practically a necessity. I've recently inquired about purchasing the piece for $300 but since I know very little about it, I'm not sure if that's what it's really worth. Also, I need to know how easy it is to find the pg-200. If it's difficult to find, I'll jump on the offer right away but if it's easy to find, I'll shop around for the best bargain. If someone can help me out with some info. on this item I'd greatly appreciate it. Thanks

The PG200 will allow you to tweak all patch parameters simultaneously, rather than editing one at a time (the default JX-3P method).

Same holds true for the GR-700 guitar synth which uses the same synth board as the JX-3P.

Colin