The FZ1 guys have got wise to us. Used to be they couldn't give them away. Now they know we are buying them, prices are fluctuating.
I paid $50 including shipping for mine, which is an 06 with 7K on it.
I have seen them go for as much as $125.
Remember, the 06 has a slightly stiffer spring than 07 and up. I don't remember by how much and I'm too lazy to look it up!
They dont pop up on fleabay much, but join our sister site and throw a feeler thread up. I scored mine in 2 days. Honestly, I recon that $50 to $80 is a decent price. They may be better than what we have, but they are still just a cheap oem unit.