When did the Black & Yellow Dr Dre. Beats Solo (HD) come out?

[YourMommy24]

I got a pair of the Solo HD's. They are black and yellow. I was just wondering when these Beats came out? Are they new? All I REALLY want to know is, WHEN DID THEY BLACK AND YELLOW DR. DRE BEATS COME OUT AND HOW MUCH ARE THEY WORTH??!!?!?