GearXS via eBay offers this Blind Spot Oval Mirror 2-Pack for $4.99 with free shipping. That's a buck under our mention from last week, the best now by $2, and the lowest total price we've seen. Each mirror measures 2.25" x 1.5" and has an adhesive backing.

Update: thamesmall via eBay offers it for $1.74 with free shipping.