Further to my previous reply, you may like to check these outfits out. They
advertise in the UK magazine Electronics World.

http://www.testequipmenthq.com/ was advertising a number of Agilent/HP 8561B
& E, 8595E with various options, prices to sell in range of GBP6k to 10k, to
rent GBP200 to 300 per week, for 4 weeks.

http://www.telnet.uk.com/ is advertising a range of Agilent/HP instruments,
with spectrum Analysers among them, but their advert does not list any 6GHz.
Other stuff looks to be price commensurate with the previous link.

These would be the order of price I would expect to pay for something
second-hand of this performance, but do not know if this matches your
original request for "cheap".

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