There's only about 2 hours left but this sale is actually not bad. You have to add to cart to see the discounted price. And it looks like despite the site saying Ko-ken is 15% off it's actually 25% off. The pricing on some of the ratchets in particular beats Amazon Japan when you add in shipping. A couple examples:
3726z (3/8 standard flex): $54.88
Palmac Tool Company offers the Koken Z-Series 3726Z-72T | Flexible Ratchet, Reversible- 3/8" Sq. Dr. to order online with a best Price Guarantee. Fast Shipping Available.
palmac.net
3726z-280 (3/8 long flex): $75.16
Palmac Tool Company offers the Koken Z-Series 3726Z-280-72T | Flexible Ratchet, Reversible- 3/8" Sq. Dr. to order online with a best Price Guarantee. Fast Shipping Available.
palmac.net
They also have a few Stahlwille sets that come out to about the same price as Amazon Germany with the discount. You have to search by item number from the Stahlwille catalog to find anything, their descriptions are terrible.
96410405 20/8 metric deep offset: $107.27
We Specialize in Torque, Assembly and Production Tools for Aerospace, Medical, Defense, and General Manufacturing.
palmac.net
96414402 20a/6 SAE deep offset: $107.27
We Specialize in Torque, Assembly and Production Tools for Aerospace, Medical, Defense, and General Manufacturing.
palmac.net
96410704 23/8 Corona DBE: $115.77
We Specialize in Torque, Assembly and Production Tools for Aerospace, Medical, Defense, and General Manufacturing.
palmac.net
These can be had for less at Mister Worker but looks like they don't ship until mid-December.