Here is a new search engine for comparing prices and lots of stock images ( the kind professional photographers use). For Prices as low as $1-3 you can test,evaluate and buy very beautiful images to really zing up your marketing collateral as well as client presentations. Here is an example of querying for the word analysis and the images that come in.
Compare these results with the free results in Google Image Search and you can see that it is definitely worth a dekko given the very low prices that are checked here and the multiple websites that are listed.
Google Image Search (free) for the word Analysis
Spider Pic- Options to buy Images for as low as 1$ for your presentation