You can buy jtags here..
http://www.tailor-madecircuits.com/shop/index.php?cPath=23&osCsid=5cbc6dce464dec83d198de0d0f271a61
Also, have you got a DevBoard??
I have one somewhere, it connects to the EXT port, and you MAY be able to fix your system via that too..
It's gotta have more than one use (USB HDD's).