The question is false. Only because a coin is below $1 doesn't mean it's a cheap coin. It also depends on the total supply. If there are a 100 billion coins, do you think $1 is cheap?
I don't think which prices coins are cheap. Because which coin is cheap or expensive it's depends on the circulating supply. 1$ is not a cheap coin in any supply. But max supply is really effect in coin price. 100 billion supply coin never reach 1$.
Yes when market provides more coins than the actual demand then the price falls itself, we will have to maintain it when the price falls only then buy more and more so it will increase the price and we will see positive change in price of market, when price falls we get the chance to make more profit but on condition of holding because without holding we cannot make remarkable profit.