TomTop offers the SQ11 1080p DV Mini Infrared Night Vision Concealed Camera in several colors (Black pictured) for $9.99 with free shipping. (Anderlink via eBay charges a few cents more.) That's the lowest price we could find by a buck. It features a 140-degree lens, clip, and mount.

Note: This item ships from China and may take up to six weeks to arrive.