Actually, I was just going to use some envelopes laying around here that were for CDs/DVDs. They're nice and padded and not gigantic. Although, I think I have some bubble mailers at my office too.
Priority just seems expensive for a 3ml bottle of juice. Yeah, I know, I'm a cheapskate. Sue me!
Use a small bubble envelope or cut one in half. A 3ml bottle in this should only be 88 cents first class metered.

Then have to catch up and read 30 messages before I can understand whats going on! !!!
)