Here are a few sites you may want to check out for some free stock.
This article from digitalimagemagazine.com talks about 25 – and is a bit outdated but here are my recommendations.
Stock.XCHNG is a great site for free stock photography. Searching and browsing is a breeze…
Every Stock is a search engine for free photos, and it searches many of the sites listed on the article linked below.
Imagebase has photos that are free to use, and are licensed under a Creative Commons license.
Morguefile is a completely free source for stock photos and has a decent variety.
Openphoto is also another freebie site with a good search tool.