So to help others I just found a source, rather overpiced but in lieu of other options...
Please provide any links you may find with other sources, Thanks.
Way too expensive for a single key. You can get an entire keyboard for 50 bucks, free shipping.
Just search for "GL704 keyboard" on ebay or aliexpress.
I agree with the expensive point. Sadly there is no "good" solution here.
I contacted ASUS and they are willing to replace the whole keyboard, (the machine is still under warranty) but since I use this for work, I can't send my machine out for 10 days.
Their policy is a bit excessive in this case, and they lose more money this way. Bad for the customer, and Asus.
(Either by reduced loyalty if they do not offer a suitable solution or by increased cost over something trivial if they do replace it.)
Buying the whole keyboard is definitely better Value since it will allow me to replace any key or the entire keyboard in the future. But it increases the already exorbitant cost for the repair almost x3. Definitely not a good solution there in this case.
ASUS could tell me to wait for a day or two, simply look with their service team and see if there is a spare key to send out from a replaced keyboard. Fast, easy cheap.This would be fine for me too. That would be good service and would make the customer happy. But they don't do this.