Around here you pay $10/hr for an individual to come sit, using an agency will cost more than that. The agency makes money, the employee must be paid, then add in insurance and you are getting up there in price.
One we used robbed us blind—walked out before we could report her.
My sister does home health care for the same price you mentioned, and she is very good at it. Sis has been trained and worked for a local nursing home in the past. It’s not just the money, she enjoys the company of those with stories to tell about the good old days.