In the realm of sub-$100 headphones, audio quality can vary significantly from model to model. It can be a challenge to find a pair that's music to your ears, though there are quite a few in the price range that offer good-to-excellent sound.
One such set is the Audio-Technica ATH-CKM50A In-Ear Headphones, an $80 model that comes in a choice of three colors: black, white, or red. The name may not be catchy, and the plastic design leaves something to be desired, but if you can get a good fit, you'll be rewarded with exceptionally rich and balanced audio with a surprising amount of bass.