my ultimate ears Superfi 4vi earphones are broken. Sound from the left earbud is in and out, depending on some odd orientation of the plug in the jack, maybe a loose connection or short where it goes into the plug. My question is, I bought these at Apple, about 7 months ago. I can't find my receipt but I may still be able to find it. What are the chances I can get an exchange? with receipt, without receipt? If your answer is slim to none--what replacement earbuds under $100 do you suggest?