Do I have to pay tax if I buy at winbridgestore.com?

Maybe. It depends on what country you are receiving the goods in.

Tax is charged by Customs offices in the destination country based on their rules and policies.
 Customer is responsible to find out the situation in their country. Shipments from all of our warehouses are delivery duty unpaid. 
Therefore, If any, these charges must be paid by the customers. Customers take full liability for all return shipment costs, customs
 charges and handling fees should they refuse to accept a parcel due to import duties or taxes. Please note that according to customs
 regulations, WinBridge cannot declare purchased items as a gift or list an amount that is lower than the actual product price.