There is a company called commando (I think) that sells alarms. I've been out of the game for a while now, but used to be an installer. These alarms were exactly the same as the vipers of the past (down to pinouts and wire harnesses IIRC) but for a fraction on the price. I assume they are still out there and still are re-branded vipers. I would definitely look into them if you have someone to install.