clipart.com
6 million royalty-free clipart images, photos, illustrations, vinyl-ready images, fonts, sounds and Web graphics offered by subscription. 1 Year for $169.95
Juice Drops Libraries
"Royalty-Free collections of backgrounds and illustrations that are completely customizable to fit your projects. Most volumes contain 50-100 Layered Photoshop® files per volume"
Pro Background Art
"Pro Background Art is home to thousands of professionally designed backgrounds and stock photos for use in Microsoft PowerPoint presentations and multimedia projects."
