Powerhouse Products in Memphis has a new one out. I don't think piston mods are required with it. The Lockbuster is on their site. It's new and they don't have a price listed yet. You could call them for a proce.
The Spiro Locks also have to have the ends ground with a small hook on the ends. The lock buster won't work without this feature. Most spiro Locks come already ground. Small screwdrivers will work, but this tool makes the job real easy. I got mine from SRP.