The sentence before the third blank suggests a difference between the price for vintage print and nonvintage print. This is something that can be taken advantage of.
Definition of duplicity
plural duplicities
1
: contradictory doubleness of thought, speech, or action
the simplicity and openness of their lives brought out for him the duplicity that lay at the bottom of ours — Mary Austin
; especially : the belying of one's true intentions by deceptive words or action
2
: the quality or state of being double or twofold
3
law : the technically incorrect use of two or more distinct items (such as claims, charges, or defenses) in a single legal action