Product Images

Hi there everyone. I am continuing my last post basically. So everyone told me not to sign up for Amazon Affiliate till I get to a certain point and start getting visitors and that makes sense. But now I am facing an issue that I cannot use images from Amazon Directly. So from where can I get proper product images like Amazon for free. Can you guys tell me any good site? Like if I am searching for a particular tennis ball where can I get it for free? Thanks a lot everyone.