My brand new iPhone 5 screen shattered and I am unable to find replacement parts. Has anyone been able to find the new iPhone 5 screen?

This is technically the correct part. But OEM does not actually guarantee it is Original Genuine Apple part. Also, most parts that are of true quality to use, are very expensive, more than the $229 Apple charges to replace the iPhone 5. The iPhone 5 front screen assemblies have many very expensive components attached, ie Home Button, Sensors, Camera if yours comes without these you will have to transfer them to the new assembly. Also, you need to buy at a minimum a front screen assembly that includes the Front Glass and LCD Display. If it is just the Front Glass you have essentially been scammed. Hopefully you have found yourself a very good deal, tell us how it goes.

Apple does not sell parts. There are no legitimate sources for iPhone parts at all.

You're better off to just bite the bullet and pay for the out of warranty replacement. If you attempt to fix it yourself and fail, you will have forfeited your right to an out of warranty replacement phone.