I wouldn't buy ultra pure smokeless stuff, as far as I know it just has lots more nasty chemicals in it to make it "appear" cleaner when burning but actually it isn't. Regular kerosine or parafin (both are lamp oil) will do just fine for outdoors burning fun. Do you have farm type shops by you? They usually have stock too, and petrol stations often sell it over here but I don't know if they do in the US.
Good luck, I hope you find some soon

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Becoming a Dad is the best feeling in the world

Watching them grow teaches you a whole new type of love