Hello, I would like to purchase some vector images to use on items I sell. What are the best websites to purchase vector packs that are royalty free? Thanks.

You can get free clipart from www.openclipart.org. I've never seen a site that specialises in vector packs. I'm only familiar with the normal sources of royalty free works, such as http://www.sxc.hu/

Maybe you can buy some vectors at a low price because the vectors will be excellet and high-quality.
Here you may visit this website :http://www.pgconversion.com and learn more.

Depends on what style vectors your after..

Have you tried vectortuts? they have free packs and also ones for members only

And Gomediazine do free samples and also sell vector packs but there more skate orientated and mainly for illustrator.

Or you could use Gimp just an idea if you get some free vector images for illustrator or photoshop import them in and convert them to a gimp brush using greayscale you can then use it as a custom brush its brilliant i use it for skate decks