Drop (Massdrop) has their HD 6XX on sale for $195. $25 off the regular price of $220. At that price I picked up an extra set.
For those that don’t know, the HD 6XX is based on the Sennheiser HD 650. IMHO (and the opinion of others) this headphone is an excellent match for the Bottlehead Crack.
NOTE: expires Sunday at midnight PST. I am not affiliated with Drop in any way. I'm just passing along what I consider a good deal.