Affiliate programs are a great way to do this. By posting a link to certain sites, which you sign up through beforehand, you can earn money based on the number of clicks that link receives. For example, with the affiliate program for beach cruiser bicycles, every time someone clicks on the link to look at the bikes, the clicks are counted. After a certain number of clicks, you get paid.
This is the perfect time of the year for clicks related to bicycle sales. After all, Christmas is just around the corner, and many bikes will be bought to be delivered by Santa on Christmas morning. The amount you get paid as an affiliate usually isn't enough to get rich on or to make a living by, but it certainly can help with the costs of running the site.
***This is a sponsored post***