Last year we stumbled into a bunch of 10 watt 2.4 GHz amplifiers at the Chicago FM Club's Radio Expo 2010, in Belvidere Illinois
There were only $20, and were actually pre−driver amplifiers, part of 2.5 GHz Multichannel Multipoint Distribution Service (MMDS) systems being removed from the air.
They put out around 10 watts (+40 dBm) with a 100 milliwatt (+20 dBm) RF input at 2.4 GHz. The amplifier needs +15 VDC at around 2.7A and a −15 VDC gate bias at 12 mA. And the following documentation should get you going with this hamfest treasure.