I have for sale an unused, still boxed Sparkrite Car Alarm and Immobiliser SR-100U.

Selling on Amazon at £77.99.

http://www.amazon.co.uk/Sparkrite-Car-Alarm-Immobiliser-SR-100U/dp/B003A0FQEM

£30 (including delivery)

I use to sell this model of car alarm back in 1991.....

And it's still current and one of the best available today!