How do I get stock images for business cards?

I want to design business cards templates to sell (for clients, Zazzle, and other places). Now, I see a lot of websites that offer stock images, but I don’t know if I can use them since I plan to sell the business card template, not use it for myself.

Am I allowed to do this? If not, can someone please instruct me on how to get stock images for this purpose? Thank you.

I don’t know anything about stock images, but you can try some Public Domain images which are free to use, even commercially. Here are a couple of sites from which I get images: http://www.openclipart.org and http://www.clker.com