How does everyone handle their ordering of makeup? Do your artists each get the exact same things? Do you allow them to request specific things? Do you only use certain companies?

I am in charge of doing the order for my haunt and have been for quite a few years but every year there always seems to be some new issue arising in trying to make everyone happy. trying to see if anyone has some foolproof system of ordering and making sure everyone gets what they need and are still happy.