You'll probably spot it on the A4Tech website; it's a Taiwan based company whose products, made in its Chinese factory, many well known companies rebrand under their own name.
Quality is excellent. I have the Typhoon Navigator wireless keyboard and mouse version of one of the A4Tech products, which cost £19.99 at Lidl about a year ago.
The same keyboard and mouse, this time rebadged by Trust, was £39.99 at Staples.
See this recent thread for more info: