Hello,
Where can I find drywall clips?

Don't know of such a thing, but that means nothing. What are you planning on doing with them if you find them?

They are for attaching drywall in corners where there is no stud, or nailer. The are also for repairing sections of drywall

You can order them on-line here:

Prest-on - Drywall clips and wall repair kits

Well, it's a good day I learned something new.