If this is good enough, you can get decent ones made by Monster Cable and Accoustic Research (AR) at places like Best Buy; or online at places like below.
http://www.audioadvisor.com/store/productdetail.asp?sku=MCUHPY2M1F
http://www.audioadvisor.com/store/productdetail.asp?sku=MCUHPY1M2F
Below is a Y-Adapter that's not a cable. It's a straight adapter that might have least affect on the signal.
http://www.audioadvisor.com/store/productdetail.asp?sku=MCTYM2F
.
http://www.audioadvisor.com/store/productdetail.asp?sku=MCUHPY2M1F
http://www.audioadvisor.com/store/productdetail.asp?sku=MCUHPY1M2F
Below is a Y-Adapter that's not a cable. It's a straight adapter that might have least affect on the signal.
http://www.audioadvisor.com/store/productdetail.asp?sku=MCTYM2F
.