Honestly, you're better off buying more media than you need. If you have too much, you can always sell it on the forum, trade it for plants or even keep it in a filter media bag stashed behind something inside your tank for when a friend wants a bacterial jumpstart when cycling a new tank.
Important note: When I say "friend"? I mean you. For when you eventually develop a serious case of Multiple Tank Syndrome after spending some time here on the forum.