The 1050 Ti is a 75W GPU and your CPU is a 95W, they are the main consumers of power in a system. A 350W will do although more won't hurt.
Not sure what country you are buying in, it makes a difference to price and availability. Here is a suggested build.
PCPartPicker part list:
https://pcpartpicker.com/list/xgBhHN
Price breakdown by merchant: https://pcpartpicker.com/list/xgBhHN/by_merchant/
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.38 @ OutletPC)
Video Card: EVGA - GeForce GTX 1050 Ti 4GB ACX 2.0 Video Card ($144.88 @ OutletPC)
Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($39.99 @ SuperBiiz)
Total: $229.25
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-08-14 15:51 EDT-0400