Advertising on all of the sites is for a 125×125 size button in the sidebar, with some sites having other size options as well. Advertising is available in one month and three month increments. (Catholic Mothers Online also offers a 728×90 ad space at the top of the blog.)
Advertising is available on Many Little Blessings, The Homeschool Classroom, and Catholic Mothers Online, as well as greater discounts for advertising longer term, as well as across sites.
Pricing ranges from $15 – $120 per month.