Brent -- I've never played that particular mouthpiece, but will just say there there is a whole lot of badly manufactured junk sold on ebay, most of which the seller calls "pro". Although dave could be right about a reed strength concern (try a few different strengths to see), I agree with his suspicion that it is an issue with mouthpiece or ligature.
The best thing you could do is try a bunch of mouthpieces -- is there a store in your area that has a good selection? (If you post where you live, someone may be able to recommend a shop within a few hours drive.) Its worth driving somewhere, spending a few hours blowing on different pieces, and see what works for you. You may find that you are squeaking on a lot of different pieces -- that would suggest an embouchure problem, which a good teacher can assess and fix. You may find that you don't squeak on any (or few) mouthpieces made by the major manufacturers (Morgan, Meyer, Otto Link, Berg Larsen, etc, etc). If that happens, ditch the ebay mpc as soon as you can afford. Good luck!