Do a search on eBay for "electroline UG2402". This particular model is not always available though.
Found one here:
http://cgi.ebay.com/ELECTROLINE-EDA-UG2402-4-PORT-CABLE-AMPLIFIER_W0QQitemZ170178589194QQihZ007QQcategoryZ39803QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem
Found one here:
http://cgi.ebay.com/ELECTROLINE-EDA-UG2402-4-PORT-CABLE-AMPLIFIER_W0QQitemZ170178589194QQihZ007QQcategoryZ39803QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem