Ok, I have a few things I want to sell on here, and what's holding me back is that I am clueless about what stuff should really cost for shipping, and what the best way to go about it was. 1 thing is that the only thing I can really get to on my bike is the post office, anyone think the flat rate shipping is a good deal? For instance, if I was trying to ship a crank and sprocket from CT to PA, how much might it cost? Any advice is appreciated. Thanks!