I haven't bought one (yet) but Mattel is selling a toy RADAR Gun
for about $25. The idea is to measure the speed of Hot Wheel cars or your buddies on bicycles. At first I thought this couldn't possibly be real RADAR, but the box clearly says 10.5 GHz!A little searching on the net found this Australian post that has internal pictures and discussion about hacking and modifications.
I'm sure for $25 it isn't going to compete performance-wise with a "real" gun, but it looks like a cheap source of parts for a 10GHz oscillator and detector, along with a PIC FFT circuit!
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