This is my Ebay auction for a sealed 1600 XBL points card and sealed 360 headset. $19.99 w/$24.99 BIN and $2.99 S&H.
http://cgi.ebay.com/XBOX-360-1600-LIVE-POINTS-SEALED-W-FREE-HEADSET-SEALED_W0QQitemZ270094538698QQihZ017QQcategoryZ122517QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/XBOX-360-1600-LIVE-POINTS-SEALED-W-FREE-HEADSET-SEALED_W0QQitemZ270094538698QQihZ017QQcategoryZ122517QQssPageNameZWDVWQQrdZ1QQcmdZViewItem