I have a plastic box that I ordered from Amazon, but can't find them on there now. It is the same one you can see in the picture on the "plastic snuff boxes" heading on MrSnuff, but they don't seem to exist anywhere. Probably the company that made them is gone or something, or stopped making them. A site like the one linked above is probably your best bet. A small plastic screw-top container, maybe some Teflon plumber's tape on the threads, should work for you. I just checked the link from Spillproof's post, and there are screw-top 1/4 oz. plastic containers there that should work.