It's a very good price, but as we all know if something seems too good to be true it probably is! So I thought to myself, why not run it past the lovely knowledgable people of club 80-90

So here's the details:
Hornet Maxx 1 alarm/immobiliser
Fitted by Westcountry car alarms (who are based in Plymouth)
Fitted price £220
I'm in North Bristol, so that's roughly 120 miles for him to travel just to fit. I've seen the alarm only on Amazon for £130, so that's around £90 profit before fuel costs, which doesn't seem much to me for the time and effort it'll take. The same alarm is offered on Clifford.co.uk with a fitted price of £330.
What do you think people, should I be cynical of this offer?
I thank you
