If you are a male you can begin to quickly donate your sperm.
If you are a woman you can donate your eggs
You can also donate your plasma.
You can donate some of your hair if long enough
You can begin to mow lawns for money daily
You can have a garage sale and sell absolutely everything that is not important
You can take on odd jobs for people
Check Craigslist for odd jobs
Return things that you just bought that are not important
You can be a test subject in medical drug study experiments
You can take on two jobs instead of having one
Go around town and take the pop bottle challenge and collect $100 dollars in cans a week
Ask 1000 people for a dollar being that they give it to you
Ask 1000 people for four quarters
Take surveys on MTurk
road work at night time (traffic controller)
prostitution? you said fast.
Get a job.
