We got two possibilities for you.
www.bargainbasementcontent.com is fine for filler and you can give it to your affiliates.
100 sets OF YOUR CHOICE should do it for 10K images if you choose right. That can be solo, two girl or boy girl.
Or for the better quality more front end stuff, there's.
www.paulmarkham.com
50 sets OF YOUR CHOICE will give you around 5k images. But as you can see this stuf fis not given away.