Very good price for something I don't believe goes on sale.
And the inspector is correct, NEST does not meet the requirements for visual signaling per Ontario building code.
EDIT: The last comment in the post you linked is wrong, NEST does NOT meet code for renovations as all (permitted) renovations are subject to building code at the time of permit application, and the visual requirement has been in place for quite a number of years (about 10 years IIRC). These smokes are good for both new construction and retrofit/renovations.
