Last November, Andreea Matei made money from her Amazon side hustle for the first time. They've earned her $21,700 in eight months, an average of $2,700 per month, according to documents reviewed by CNBC Make It. "I have not had any time to make videos this week, and the money still keeps coming in." Matei discovered the program while watching a YouTube video called "the world's easiest side hustle." Matei says the side hustle keeps her from getting burned out at her day job, and the extra cash is obviously nice.

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Persons: Andreea Matei, Matei, she's, They've, she'd, Warren Buffett Organizations: Amazon, CNBC, Facebook, YouTube Locations: Fort Collins , Colorado