I tend to get photos of what I need at Flickr, in which the majority of photos of the type I want are under creative commons licensing or outright free to use. And usually high rez. It's a great resource for materials. There are a couple of other sites like Flickr on line, but they don't always outright post the statement of use rights as Flickr generally does.

Talent is God's gift to you. Using it is your gift to God.