The new OSCAR 100 satellite in geostationary orbit has a downlink in the 10 GHz band and an uplink at 2.4 GHz.
I was looking through the most recent edition of the Dutch Kingdom Amateur Radio Society magazine and I noticed this transmit upconverter...
The price seems pretty modest for what it does although I don't know anything about its performance.
From what I understand, something like 2 watts into a 2.5-3 metre dish or 10-20 watts for a 1-1.5 metre dish is required for an SSB signal for the uplink at 2.4 GHz.
For more information, go to http://www.dxpatrol.pt/