Mellow Ads has a Faucet where you can claim 500, 1000 or 3000 Satoshi once a day.
This Satoshi can not withdrawnen. But you can use this Satoshi to buy Daily Banner or Pop-under Campaigns.
The minimal price for a daily campaign is 0.00001 BTC.
Simple claim the faucet two days and make 2 Day campaign of you choce for your Referral Link.
To start a campaign you must first make a adverts. Simple load all the promo material (banner) from the site you what to promote down. And make a new adverts with the banner's and your Referral Link. Then get your adverts are approved, this can take up to 24 hours.
Your now ready to start your campaign.

Join here