For general lubrication , such as the clutch and brake cables and brake pedal pivot, you can use a clean plastic squeeze bottle with a droplet type spout. You're only going to need a few ounces and you may have an empty bottle at home that you could reuse. If not Wal-Mart & Target usually carry empty plastic squeeze bottles.
If you want a "Dorothy can", then just take the first left after Wal-Mart and follow the yellow brick road, but watch for falling houses.
You can find some small grease guns at most auto parts stores that are already pre-loaded with a little grease cartridge.