Answer:
low-ball technique
Step-by-step explanation:
Based on the scenario being described it seems that you have been a victim of the low-ball technique. This is a persuasion tactic in which an item is marked at a very tempting low price in order to get customers to commit to the purchase, but when they do commit the price is increased in one way or another. Which in this case was by requiring extra components to be able to use the camera.