Amazon - Shimano Ultegra R8000 Shifter ST-R8000-L Left (front), Shimano Ultegra R8000 Shifter ST-R8000-R Right (rear) | $314.99
Ebay - Shimano Tiagra 4700 Shifter ST-4700-L Left (front) Clamp, Shimano Tiagra 4700 Shifter ST-4700-R Right (rear) Clamp | $230.99