I don't have a cable from CH, just gave you a link since you asked.
To my knowledge, there are no coupon codes available for Noble, period. The list prices are what you pay. The one exception thus far was last year's Black Friday weekend sale.
@SDBiotek is right, there are no coupon codes available at this time. We just had that functionality added to the website in case we wanted to use it in the future.
My desktop gear has weaknesses. HD800 does most stuff wonderfully, but there are some tracks where it isn't perfect, could use more body. Same with LCD-3's. Great mids! Oh my! But the soundstage/comfort lacks. LCD-2 has very punchy bass but there is no sparkle on top, and closed in sounding. Point being, with those phones, there's always a track that pops up and you think "this would be preferable on another headphone". I don't get that with the K10. It shines with everything I've tried.
Sure the K10 is divorce-inducingly expensive, but like with sports bikes and muscle cars: It's all about smiles per gallon.
I think its quite the opposite, whoever buys me a set of K10's, I will marry.