They are extremely easy to order from and the one in my car works just fine - youll only use a lot of data / texts for testing. The novelty of checking your car location every 5 minutes wears off after a few weeks :)
Klipspringer: I like the idea but to me I would rather have my car insured. I somehow don't fancy the idea of retrieving my stolen car. Who knows what its going to look like after a few hours.
HTPC / Home automation (home assistant) enthusiast.