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if my understanding is right, a scalar analyzer will not give you phase measurements whereas a vector one would.
From what your requirements are, it seems like you need a Vector one. India doesnn't have any vendors that sell VNA's. They all need to get them from the US or elsewhere. Don't know about china. Check the Agilent, R & H websites. R&H advertised a low cost one a few days ago although "low cost" is a very relative term but should be a starting point.
Why doesn't some enterprising company in China design and sell a $10,000 20 GHz network analyzer? With modern DSP processing chips and broadband mmics, it would be a snap. They would put agilent out of the microwave test business in a year!
As far as buying used, good luck. The high frequency stuff on ebay is still sky high used ($20,000 for a 20 ghz rig) and agilent will not support the older models, so if it arrives ~busted, you are out of luck!