Piano, tennis and other tips (Kathmandu)

Good evening everybody. I might be moved from Europe to Kathmandu in the coming months so I am trying to plan : what should I buy and move over there ? Could anyone tell me if it is possible to buy in Kathmandu a new piano, classical or electric ? and how is it possible to play tennis, are there courts in town ? therefore, is it easy to find tennis gear as well ?
Any other essential goods my wife and me should absolutely bring along with us ?
Best regards
Marco