Do you have a multiples related site? If so, you might want to looking into Cafepress’s new Affiliate program where you get 20% of any sales that come from click-thrus from your site. I have a twins related cafepress store and just put up an affiliate page which has instructions for joining the affiliate program and contains all the html code you need to add a link to your site. If you are interested, you can read more about it here.
My chaotic life raising six kids