Product Reviewer - What do I count as income and deductions?

I have a side hustle (hobby) in which I review products advertised on Facebook. I purchase the things referenced in the ads, pay for them, and then review them. Then I get a refund for my purchase plus an additional $6 for each product. The review website pays me in USD via PayPal.

How should I go about reporting this? Can I deduct any of the product costs as expenses? I'm not self-employed, and the review website does not provide me a tax slip. This year, I received around $1,500 USD from them, the majority of which was reimbursement for purchases.

 

Thanks!