Hire college students to help promote your sites online and pay them commission for any sales that come from their affiliate links. Hint: give them their own domains that redirect to their affiliate links!

Hire some site promoters and pay them on a commission basis. They can then promote your sites in exchange for a share of the company revenues.

Purchase business cards with your domain on them and distribute them everywhere you go. Some online business card service providers like vistaprint.com offer free business cards while all you’ll have to pay is shipping. Check them out!