.65 Bitcoin. A little bit negotiable.
Hmmm... expensive. That's like a 2 year ROI at current difficulty IF its running 24/7 theoretically. I doubt graphics cards will even last that long on continuous runs. Pretty long downtime when you go for warranty regardless of the brand in my experience. I think you will get better sales if you sell the components individually on ebay/OLX. Those cards will sell real fast on ebay as they are still considered rare in some parts of India.
Ebay is the worst place to sell anything in India anymore.
Even for personal trades you need to come up with GST numbers etc etc. Plus their final value fees are ridiculously high.