electronic bike protection and tracking questions

[Xeriod]

Hi Im a newbie on here and just finding my way around.

My question is this: does any-one have any suggestions for buying and fitting a tracking device to scooters and motorbikes that don't cost the earth like bike-trac, or are they really worth all that money to fit and also pay £100.00 every year for the service ?

had a look around the mag site but couldn't really see any helpfull info