I am looking to buy Muffler prescription frame earsocks. I have the black frame, but looking for any other colours that are out there. Anybody know where I can find them? I went to an opticians that deals in Oakley Rx frames, but they told me they have to be specially ordered and can only be fitted with an accreditted Oakley dealer. They come off the frame pretty easy and look like anyone can fit them, so think this is bogus advice. Any help greatly appreciated.