I personally tested this and it works. Go to cashcrate.com (no affiliate link here). This is a "get paid to" site. You fill out offers or surveys and they pay you. Basically they are promoting cpa offers and give you a cut of the commission.
Ok, fist sign up. Find all the offers with the highest payout. These are going to be free trial/re-bill offers. I had a visa gift card laying around from the holidays with maybe $1.76 left on it. For the trial offers I used this card. When you put the credit info into the offers they generally authorize a dollar transaction to make sure the card will work when they try to bill you later. To my surprise I was credited for completing the offer. I filled out offers until I got to the $20 threshold and the waited for my check. A couple weeks later I actually got a $20 check in the mail.
(this is not blackhat. You can obviously load money onto the card if you wish to continue the service)
So next time you you go buy groceries grab one of those visa gift cards, buy your stuff with that and use that last little bit left on the card to turn into more money.
I know this seems kinda lame but if you really need money to start marketing this could be your start. I would love to see the wso of "how I turned $100 into $47,000,000". Everyone starts somewhere. So now you have no excuse to get started.