If its $300 and brand new in the box, the most I'm paying is $200. Anymore I can just make a trip whichever closest store stocks them, probably screw them down a little and walk out with it for around $280.
The hassle of buying it privately, is it as good as it says, picking it up, paypal, returning it if its faulty is not worth the hassle to save a few buck, it has be at least a 33% saving.