Sidebar ad: Rates start at $75 per month (or any portion thereof), or get two months free by paying $750 for the full year. I can support HTML, a stand alone image with a link, or an embedded Amazon link. (I can't offer CPM.)
Sponsored post: Flat rate of $150 and subject to topic approval. Posts will remain on the site indefinitely. (All sponsored posts will be noted as such.)
Contact me at firstname.lastname@example.org and we can work out exactly how your ad will appear. Payments can be made via PayPal or by check.