Zune Home A/V Pack https://www.amazon.com/dp/B000IXP946/ref=cm_sw_r_cp_apap_iPn3kyix7QYkg

Here's a couple other things (If anyone knows of a source for OEM or incipio cases for the HD please pass it on!)

I believe this is the OG Dock for the 30

This is the dock/AV kit for the HD

Possibly a different version of this kit