If your friend likes slim keys, how about the Topre HE0100? I like slim keys which is why I got it, love it for gaming (The JP layout and PS/2 port may be a problem for your friend though). There's a used one going on Taobao right now for 800RMB too, pretty much the cheapest topre you'll be able to find.
Better yet, if your friend has been using scissor switches all this time, the Topre will feel very similar, just much better.