Cardano is not cheap coin. 2,5 billions dollars of total capitalization it is quite expensive. If you are looking on price of each coin, than it is mistake. It is completely wrong way to determine price of cryptocurrency.
we should understand the technology of cardano and the applications for crypto economy . Look at the XRP , total amount is more than 50 billion but it's more expensive than cardano and I believe The price is cheap to buy at this time.