It's risky to Buy bitcoins certainly nowadys. If you are determined to buy, then I suggest you to buy at its lowest price within a certain week. I know it's hard to know when will be the time to purchase but you can do it through observation. Have a one week observation and mark the lowest price it hits then buy when it reaches or closest it on the following week.
Or in order to earn just participate here in the forum. You may find lot of ways to earn and save. So you can be in the boat with us.
Be wise. Prices todayis no a joke. It gets harder you know.