Packing cases for hard drives

Greetings,

I'm looking for a vendor who can sell small quantities of plastic clamshell hard drive cases to use for transporting drives in Pelican cases.

We've been using the original packing materials that come with drives for later transportation, but many drives come in pretty sizeable plastic inserts and we'd like to find something smaller. I've seen people use VHS tape boxes but they're still a bit large and not always a good fit.

TIA.

-David