HELP! mining RIGs suggestion

Hello friends,
first, I want to thanks the community for previous answers.
I want to mine zcash and i want to with 50 cards. i want to know where i can get the cards easily and what is best place to start the setup. I can go upto 500 cards but first i want to go with 50.

From INDIA but can buy around the globe if cost is low.

Need your guidance