You can make it yourself. Just go to a local electrical supply place and get a chunk of 16 gauge zip cord and the requisite ends. Or, since zip cord extension cords are dirt-cheap (a small one is usually a couple of dollars in the US), just find one with the female end you want, cut it off, and put on a 2 prong male plug (they make ones that are simple to put on with no tools). If it's polarized and you want it unpolarized, just file off the extra metal on the neutral prong. Make sure you know what you're doing though -- the polarization is there to protect you.