Where are you from? Is there Wal Mart nearby? Look in the bikes section.
I had to go to 4 different stores before I found 2,but even if you get only 1,make sure that goes on your rear.And to save headaches,when you get that new tube,go ahead and spend another 10 bucks and get the right tire to go with that there. You'll save headaches,believe me.
You'll want new tires anyway for it's gonna outlast your ride.
From what I gather,90% of motoredbike flats happen in the rear.
And I needed three tire irons and lots of soapy water to get her in there. The tire irons were only spaced about an inch apart. Take your time. It will go in there. Make sure your rim isn't that lightweight skinny rim. Get a regular size rim with good sidewalls. The rims on my bike came off a Huffy.
Nevertheless,it's called NoMoreFlats.