Ktmail via eBay offers the Men's Skeleton Dress Watch
in four styles (Silver/Black Strap pictured) for $7.98
with free shipping
. Outside of other eBay vendors, that's the lowest total price we could find by $4, although we've seen similar watches for up to $6 less. It features include a see-through mechanical design and caseback. Note that this watch uses a battery movement and is not self-winding.