Indeed, prices dropped further in the last day or two which surprised me since the HD560S has held its $200 price tag since release to just a few weeks ago. I would caution against ordering from Amazon though as I've read around that Sennheiser no longer trusts Amazon as an "authorized retailer"...
World Wide Stereo via Walmart has it for $169. You can also order direct from Sennheiser for 161.95 since the 10% coupon stacks with the current discount but ordering direct from Sennheiser site is notably hit-or-miss.