We have a Yale lock in our Project and £80 for the Module sound correct - We paid that
To get it on our system - we did remote and cost me £10 and then we did the programming via HE.
Check out user SENSE - He is selling some T3 on the for sale section - Sounds like your dealer is having you over
Use a remote guy. there are a handful on this site. My experience is that they make the local guys look like amateurs because they have a much wider band of experience. They do it at about anywhere from 1/2 to 1/10th the cost. I had "programming" estimated at $8,000 for initial project build and no custom programming. Just basically installing drivers for equipment I had etc. Remote guy did it for $450, it took us a grand total of like 8 hours. 3 years later everything still working perfectly
