You don't state if you need: Operating System (OS); Monitor; keyboard/mouse; Wifi and/or Bluetooth connectivity. Also, which country will you be purchasing in as it makes a difference to availability and pricing. Supply any preferred online vendors you wish to use.
The build below contains components which will support most games at 1080p at High/Ultra settings. Determine if you will need this and we can re-evaluate the build once you have answered. To view/edit the build just click on the first link.
PCPartPicker part list:
https://pcpartpicker.com/list/8c9KJV
Price breakdown by merchant: https://pcpartpicker.com/list/8c9KJV/by_merchant/
CPU: AMD - Ryzen 3 1200 3.1GHz Quad-Core Processor ($99.99 @ Amazon)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard ($74.49 @ SuperBiiz)
Memory: Crucial - Ballistix Sport LT 8GB (2 x 4GB) DDR4-2400 Memory ($93.49 @ Adorama)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.89 @ OutletPC)
Video Card: MSI - GeForce GTX 1050 Ti 4GB Video Card ($201.99 @ SuperBiiz)
Case: Zalman - T2 Plus MicroATX Mini Tower Case ($35.99 @ SuperBiiz)
Power Supply: SeaSonic - S12II 520W 80+ Bronze Certified ATX Power Supply ($42.99 @ SuperBiiz)
Total: $593.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-24 08:03 EST-0500