Is there a way to find a picture that I can use for free as a logo for my business. Actually I am ready to pay $10-$50 for this:

I am going to use it as a logo of my website and in printed advertising.
This is going to be a logo for a training; there will be a picture of several people holding hands together, maybe something with humor. This must be not a photo but something CARTOON style.

As far as I understand I can't use whatever I find in Google pictures for free:., right?


Any ideas?

Thank you.