The Casio Outlet (USA) has all three watches from the translucent G-Shock DW5600SB Color Skeleton Series on sale for $69 each (plus at least $6.86 for shipping). This is a great chance to get these unique, eye-catching watches at a discounted price. They are also available at Amazon with similar discounts, though some third-party sellers may not be authorized resellers that include a warranty. According to G-Shock.jp, these models are no longer being produced.
The Casio Outlet also still has some limited edition watches available, including collaborations with Futura, Asics Tiger, New Era, and Illest Brand.