I'm a dyed in the wool Printmaster fan but occasionally go to Discovery also for some extra stuff. The direct link to the clip-art is school.discovery.com/clipart/index.html
I have Print Shop as well, but prefer Microsoft Home Publishing - I find it's more user friendly. I also have used microsoft.com & DiscoverySchool.com - I love DiscoverySchool!
You can go to www.microsoft.com. They have tons of free clipart. You can download them or just use them from the site.
I recommend Print Master or Print Shop by Broderbund. I bought mine for $10.00 at Wal Mart. I love it, I use it for personal things and PTO things. They make great gifts too.