I have this one in my 370Z, with a trim piece from the Z Store. Total cost was about $55 delivered for both parts. You don't need to spend $325 for a machined and nicely weighted knob with some ghey looking turtle on it.
435G HEAVY WEIGHTED 6 SPEED STEEL JDM SHIFT KNOB FOR 350Z 370Z Z33 Z34 ALTIMA | eBay