You'r talking about your system dvd's?
Apple may still supply the original restore CDs/DVDs for a nominal fee. Have your serial number and model information available when you call them. You do not have to be the original owner.
AppleCare Support Phone Number: 1-800-275-2273
open 6am to 6pm Pacific Time
Apple Phone Sales 1-800-692-7753
International Technical Support Numbers
My applications cd with Garageband and iMovie and that doesen't work.
What to doo?
Those applications are part of iLife. You will need to buy an iLife disk, version 8 or later, from eBay or Amazon.
iLife disks from Apple no longer include iDVD or iWeb.