someone at leel 7 or 8 has budget 1B.

[BeckStar]

That's what i had at Lv 8 o well.. it's possible, there are many ways to earn money, the guys above
listed em.
an advice, don't rush to collect too much money now, you could start doing it when you reach Lv 14-15 or so.. that's when you gonna need much. For lower levels just collect as much as you need.