I would like a small vent the length of the house on both sides along with a ridge vent. You can stand in my attic and see daylight all along the front and back as well as the ridge which gives the roof an 'ice house' effect, allowing ambient air to sweep up the length of the rafters to cool the shingles.
The issue I would have is my underhang (proper term?) are slotted boards so I couldn't cut through them all to install a vent the length of the house. Doing so might mess with the structural integrity.
Tx, I'm guessing that you have about 50ft of ridge vent and that should run about $9.00 a ft for labor and materials on a walkable pitch. Intake vent for the soffit leaves about 450.00. It's not out of line depending on what they are installing, how high is the soffit? What kind of access? It doesn't sound out of line. Not a brother-in-law deal or a felony hold-up.