Dalin 6962 via eBay offers the SOG Specialty Knives & Tools Key Knife in Black, Gold, or Silver for $4.70 with free shipping. That's $1 under our October mention and the lowest total price we've seen for this knife in any color. (It's the best deal today by a buck, outside of other eBay vendors.) It features a straight-edge 1.5" steel blade and lockback mechanism.
Note: This item ships from Hong Kong and may take two to six weeks to arrive.