Ok! So i got my korean friend to ask on the KBDMania website about these stickers and this was one of the responses he received
"I got a response, and one of the members told me that they discontinued because they were raised they would come off so wasn't really popular. However, there are people who want to buy them still, and they download the keyboard letters sheet (which people apparently make) and they take it to a lazer cutter and just get them made themselves, since they are hard to find now.
But apparently people prefer the stickers that they can stick on a wider surface. Non of them directed me to a direct link. Another person said I may be able to go find one if I searched around the electronic district in Korea"
Not sure where i get laser cutting done tho, at least not locally and it sounds expensive... more research to do!