2nd hand in usable condition will be about $150 - $250. If you won't be installing it yourself, labour is the only pricey bit here. Highflowing your current one will machine your stuffed one (assuming no damage to the housing) and replace the center bits for about $800-1200, however for this to work in your car at full potential, it'll need another $2000-3000 worth of supporting mods (intercooler, exhaust, z32 air flow meter, aftermarket ECU, tune, maybe injectors).... and then you'll be a target for police, and/or realise you should have just spend $5000 for a nice garrett turbo like a 3071/3076 package instead of $4500 for a highflow package Buying a new turbo from nissan, if even possible, will be stupid expensive... don't even consider this Buying an equivilent size turbo to the new one, probably not worth the effort... you're throwing money at it for no gains.