Photos, Clip Art, Illustrations for re-sale

I am looking for a source that can provide images that can be re-sold as part of a "done for you" Power Point sales presentation for a particular industry. The merchants in that industry would use the presentation to present their product to prospective customers.

I have noticed that most of the major stock photo sites have gone to expensive licensing ($99 for an "extended license"). At that price, a PPt deck with 100 illustrated slides would be too expensive to make and sell.

Most of the licenses prohibit use of their images at any price in "web templates." While they don't specify PPt per se, I'm guessing it too would be a prohibited use because it's just too easy to pull the image out of a Power Point and use it somewhere else. Which could leave me holding the bag for a customer's copyright violation. (BTW, one stock photo site says if you buy an image and use it in your business brochure, that's "one use." If you want to use it in a counter card, you have to pay for it and download it again, because that's a second use!!!)

How are you illustrating your projects? Am I thinking about this the right way? Would appreciate thoughts & suggestions.

Thank you Warriors!

Robert