For audio lovers on here, the Massdrop X Sennheiser HD 6XX open back headphones that I love so much are down to $199 (I got them at $230, $279 list). They’re basically identical to the well-known HD650. Note: these are not a great option if you typically listen with people around: “open-back” means anyone around gets to enjoy your music. 
Fair warning: at 300 ohm they need reasonably powerful headphone-out, so best to check their huge list of user comments/reviews to see if your audio player of choice is mentioned.