Looking for Inexpensive Simple Alarm

Now that the Dub is goign to be parked in my parking lot, not at my parrents house I"m thinking of just getting an alarm to make sure no one breaks any glass on it (It’s irreplacable I have 1 spare set of glass and that’s it). Or dents the body… I"m basically looking for a simple alarm no remote start, no paging… to toss on the Dub… Basically just a bump sensor.
Anyone have any suggestions and prices?