To get something at a lower price
Answer: to watch
Explanation: The gerund is defined as a form that is derived from a verb but that functions as a noun, in English ending in -ing. The infinitive is defined as the basic form of a verb, without an inflection binding it to a particular subject or tense. So, choose the -ing word (watching) and make it the infinitive (to watch).
The Nurse helps Romeo and Juliet elope. Because she helped them get married, consummate their marriage, and sneak around, Juliet wouldn't marry Paris and ended up drinking the sleeping potion that caused Romeo and then her to kill themselves.