Amazon Japan has TCL-X100 (Black) listed for Y13626 that comes to about $120 including shipping to US. Just a heads up incase anyone is interested. Retailers in the US are selling this for over $300.
Make sure you order the one sold directly by Amazon Japan and not a third party seller. Amazon prices change so this price may not last very long.
https://www.amazon.co.jp/gp/product/B00JR6UU8U
(Make sure you order directly from Amazon Jp as the seller)
ps - keep in mind that this will not have any US warranty as its being bought internationally but then I am not sure if one needs warranty on a teleconverter with no moving parts or electronics.
