It depends on how much you are willing to spend and what’s the quality you would like to go for. it can range from Rs.300 to Rs. 2000 but since it’s a one time investment you should do your research and find one that can solve your purpose.
It all depends on what brand do you choose. Normally, a good brand would range from Rs.400 to Rs 2000.
Yoy could buy at any shop in Nehru place or ghaffar , you'll probably get it cheaper there.
Nehru place and Gaffar market would be some places to buy such products.
Nehru Place, the best for it, you'll get a lot of variety and it is open now.