@WalnutSpice: I've got a few Leopard-Install DVD as an "add-on" when buying white C2D iMacs for my office (I use them as "thin" clients for Remote Desktop. Great machines, look exceptional elegant.)
If you need a new screen for your white iMac maybe you'll find any offer of a defect iMac with intact screen and get a Leopard-DVD in addition too. I guess most owners of the first generations of white intel iMacs switch to a newer 64bit machine and don't look back to Leopard since they have no use for it anymore. Since the latest OS X-Versions are free of charge the old Leopard DVD are sometimes gratefully added to the iMac purchase.
So take your time and go for a replacement iMac with "Leopard-DVD AddOn"