Def worth more then 150 lol id say with out pics 250 ish...
How bad is the wobble ? Rattle and wobble kill the value somewhat but I will tell you a number based on how bad the wobble is
I spoke to quick the newer z2s are around 250 hard to give a price with no pic so we can tell which model you have
man you are getting ripped off... if you pay $250 for any z line, youre getting ripped off. check on the forum here. people sell them cheaper than that. there are sites that sell them for less and if you know any reps, they sell for less depending on the model you are looking for.