I mean , i really want to invest in this , but the price is too much high, do they go down? In what month?
You don't have to buy whole 1 or 10 bitcoins. If you have limited budget you can buy bitcoin for 50, 100 or 200 dollars. And if I were you I would buy it now before next year's halving.
There is high chance that price might be greatly increased after the halving in 2016.