If someone does not respond to this post google the FCC ID#. It may turn up something. The quick search I did turned up new viper remotes in the $150 range. Every time I go to a junkyard I ask for their key fob collection. Every once in a while I turn up what I want for less than $5. Some need new batteries, some are junk, and I use them as spare parts for others. Some companies use the same fob case with different circuit boards, so go by the FCC ID#.
A replacement remote is not much use unless you know how to pair it to the main unit or know a shop that does not charge a fortune to do the work. Searching for information on the main unit may work or some times a friendly chat with a company will get you a photocopy of what you need to know. Most shops are only interested in selling new systems, remember the ones that try to help you with problems if you ever need a new system.