If you mean 'starting with five dollars' then it is a gerund phrase
The pronoun in the sentence is the word: Someone. The type of pronoun in the following sentence is an example of an indefinite pronoun. An indefinite pronoun is a type of pronoun that does not particularly indicate a person, thing or amount.
Beneficial
Beautiful
Purer
Fresher
Hope this helps!
In is the answer
Hope it helps :)