There's a few different things out there:
Clipart - Download Royalty-Free Clipart, Images, Fonts, Web Art and Graphics - Has a lot of generic clipart which may be vectorized, there's some threads on here that include how to get a year subscription on the cheap.
Vector Art - by Holmes & Cottrell Graphic Technologies | The highest quality electronic artwork for the sign industry since 1990
greatdane.com
http://www.mr-clipart.com/
You can also check some of the major sign/vinyl suppliers and they usually redistribute some print/cut packs, which will give you more leads.
Clipart - Download Royalty-Free Clipart, Images, Fonts, Web Art and Graphics - Has a lot of generic clipart which may be vectorized, there's some threads on here that include how to get a year subscription on the cheap.
Vector Art - by Holmes & Cottrell Graphic Technologies | The highest quality electronic artwork for the sign industry since 1990
greatdane.com
http://www.mr-clipart.com/
You can also check some of the major sign/vinyl suppliers and they usually redistribute some print/cut packs, which will give you more leads.