It's a market thing. It used to go on sale often. These days I'm seeing more market deals on the 250ohm version of the DT770 and the latest released of the Limited Edition 32ohm really changed a lot of people going for it instead of the 80ohm because of the less need of an additional amplifier to really push it for portable and simple devices. Add to that the floor of closed headphones that were released this past year or so, that also land in the $200ish area, and you have a lot of contenders. Beyer also went ahead and discontinued the premium version of the DT770 (a massive, massive mistake in my opinion; just like Denon discontinuing their line, another tragic mistake). Anyhow, Beyer doesn't seem to be dropping prices to try and grab more market. Instead, they release the Custom One Pro instead (which after having all these Beyer headphones, and the COP, I think the COP is easily the worst Beyer headphone I've ever had the pleasure of listening to). I wouldn't be surprised if the DT770 was discontinued all together soon at this point.
That said, in that range, some suggestions:
Beyer DT770 PRO 250ohm (for price; there's minimal if any virtual difference truly between it and the 80ohm or 32ohm; it's a great headphone)
AKG K167 (stretch to K267 if you can if you want more bass options)
AudioTechnica A900X (this really is the headphone I'd go for in this price range, if you can stand the AT wing system instead of a full headband)
Ultrasone PRO 750 (great headphone, balanced, great build, great features/accessories, if you like Ultrasone house sound)