The biggest crash in the history of BTC has been occurred from 2 days ago till now. It' all over now. If you don't buy after reading this post you will cry soon.
It was not the biggest crash in the history, you really need to understand what a real crash means. Just a dip of more than 30% is not a crash, is just a correction/dip or however do you want to call it.
And no, do not think that just buying it on the cheapest price is always a win-win situation, because it is not.