If anyone's looking for a pair, HD650s are on sale for $295 from Adorama. Apply code SD12212014.
Daaaaamn, that's a good price!
But you have to use SlickDeals website and click on the 'Buy Now' button in order for the promo code to work in the 'Gift Card/Promo' portion of Adorama's checkout page.
It's a little convoluted, but it should work. Hers's the link:
http://slickdeals.net/f/7535232-sennheiser-hd650-audiophile-open-headphones-295-free-shipping?page=3&rpid=73084870&rp=2#comments