air, it's free, so are FREE samples!!
The cheapest thing I have seen on eBay is a webkinz code. It was 1 cent!
soda
the cheapest thing at claires is a headband that is 1.14
Bacteria in your colon
Your soul
nothing is
it depends from store to store.
Money wise, the cheapest thing in iTunes store should be 99 Cents. Be it a song, game, application, etc.But of course, the practical answer to the question is: Free!
diamond is the hardest thing on earth
All metals tend to conduct electricity. For the cheapest but hardest I would suggest high speed steel (HSS). It's not the hardest or the cheapest but is a good compromise.
There is such thing as new Earth or Earth number2. It is not very similar to earth but it has water and land on it.
Yes, But they are very expensive. Around $700 at the cheapest