I am looking for official online and offline stores to buy Antminer S9,T9.
I think you should purchase Antminer from Bitmain’s official online store – https://www.bitmain.com/.
If Bitmain is not delivering in your country then the best option is to go for Amazon.com
If you don’t prefer Amazon then prefer https://www.blokforge.com/
Other sites supporting Antminers
In my opinion, you should prefer Equihash Algorithm Antminers such as Antminer Z9 and Z9 mini because it will be more profitable than any other coin. Supported Coins – ZenCash, Zcash, and Hush.
Buy Equihash Miners from – Innosilicon
Bitmain Provides 6 months Warranty on Antminers