GunPundit offers direct sales of links in the right sidebar in the following formats:

• Premium Headliner (336px width max)
• Standard Squares (125px x 125px)
• Footer Banner (728px x 90px)
• Economy Text Links (One line)

Contact GunPundit for rates. Discounts available for three and six month terms.

For a brief overview of linking policies, see this post.