I've been on a quest to find the best IEMs around $50 and the Zero Audio Carbo Basso and Carbo Tenore are better than the Audio Technica ATH-CKN70, MEElectronics A161P, NuForce NE-700X (new and improved version). If you're looking for IEMs around $50, I highly recommend them. Both sound amazing, especially when slightly EQ'd to your taste.
If anyone has any other recommendations at this price point, let me know. Otherwise, I think I'm finished with my quest.
Next quest, to find the best around $75-$100 :)