You can sign up for a referral program at DigitalOcean which offers $200 of credit to try their products over 60 days. The program rewards users with $10 in hosting credit for each friend they refer, and $25 once the referred friend is billed $25 as a customer. There is no limit to the number of referrals, allowing users to potentially fund their entire account by referring friends. Users can track their referral stats within their settings page, including earnings and outstanding rewards.