I use #1 and #2 when I travel.
1.) An eyeglass case from the Dollar Store. Glue in some foam, and cut out for your stuff. (You're cheapest choice.)
2.) A dart case from a sporting goods store. They have some really neat custom cases. The batteries, and e-cig fit perfectly in the built in tubes that hold the darts. Small pouches hold spare attys, tiny bottle of juice, and carts. My Dart case for long term traveling holds my e-cig, 5 spare batteries, 8 carts, 8 attys, and 2 tiny bottles of juice. It fits nicely in my shirt pocket.
3.) You can check out Walmart, Best Buy, Office Depot, Office Max, and a few others for the Case Logic cases. Case Logic has all different kinds with different styles of small storage pouches and holding straps. Hard and soft covers.
4.) Small camera cases.
5.) Cosmetic cases.