Are you looking for deep or regular sockets? I see regular length Taiwan individual sockets on the Toolsdelivered site, but I do only see USA for the deeps. I only looked at 3/8 drive.
If you can't find what you want on Toolsdelivered, go to the Williams main website and look up the sockets you want there and then pop the part number into Google and you should get at least a couple results. I tried it with several sockets. To make it easier on you, any Williams part number with letters and numbers is a USA socket, and any part number that is all numbers is a Taiwan socket. I am used to navigating the Williams site, so if you want you could list exactly what sockets you need and I should be able to get you the part numbers for them quickly.