Katun
Headphoneus Supremus
Checked their site. They must have updated the code redemption. Here are the headphones exempt from coupon:
Amperior, CXC 700, HD 280, HD 518, HD 558, HD 598, HD 600, HD 650, IE 80, MOMENTUM, MM 100, MM 450-X, MM 500-X, MM 550 and (X), PXC 250-ii, PXC 450, RS 160, RS 170, and RS 180
Personally, I think Sennheiser wanting $500 for the HD650 is the joke of the century (excluding flagship bracket).
Amperior, CXC 700, HD 280, HD 518, HD 558, HD 598, HD 600, HD 650, IE 80, MOMENTUM, MM 100, MM 450-X, MM 500-X, MM 550 and (X), PXC 250-ii, PXC 450, RS 160, RS 170, and RS 180
Personally, I think Sennheiser wanting $500 for the HD650 is the joke of the century (excluding flagship bracket).