One of my in-ear earbuds is missing the rubber piece and I couldn’t find it anywhere; thus, they are effectively useless. Now I am stuck with my clip-on headphones that I use at home or on long rides to listen to music. They are nice, but they don’t over power the crowd noise when I am in the library or in the labs. Therefore, I have to find another in-ear earbud that will let me isolate myself from the noisy crowd. I’ve been recommended the Sennheiser CX-300, but the price for them ranges so much from the ridiculously high retail prices to the awfully low eBay prices (which means that they might be counterfeit).

Do you have one the you particularly like and would like to recommend?