Ralph Lauren offers its Ralph Lauren Clark Hourglass (pictured) for $136.50. Coupon code "CSS9460" cuts it to $122.85. With $5 for shipping (choose "Economy" at checkout), that's the lowest total price we could find by $28. It features a clear plastic tube with floating interior and measures 8" x 3" x 3".
Of note, also available is the Ralph Lauren Rory Leather Hourglass for $122.85 after the above coupon and $5 for shipping (choose "Economy" at checkout). That's $72 off list price and the lowest total price we could find. It features a stitched leather shell and silver-plated brass trim. It measures 4" x 8".