I always prefer getting custom built over pre-built, you control the quality of the components in the build this way. Pre-builts very often provide inferior component models.
Okay, this was the best I could do using the local online vendors. I scanned a bunch of sites and these three seemed to be the most complete for computer components.
https://homeshopping.pk/categories/Computer-Components-Pakistan/
https://www.czone.com.pk/
https://www.galaxy.com.pk/
Originally started with an i3-8100/Z370 combination but it quickly got too expensive. There is a definite lack of availability for low end CPU's and GPU's of any kind. Pricing was much higher than I expected, not sure if you can get better deals by bartering with local vendors. Would have liked to give you 2x4GB RAM but that is another 6K and we are over budget already. I would save up for another stick when you can.
The i3-6100/1050 Ti will play 1080p high settings at 50+ FPS.
https://www.youtube.com/watch?v=KzZN16RVImI
https://www.youtube.com/watch?v=tN_n1PaG2Hs
So biggest problem here is the lack of budget CPU/mobo combinations. Examples would be Pentium G4560/B250 or Ryzen 1200/B350. The i3-8100 would be a great CPU as it is equivalent to an i5-7500 and the price of 15500 is great but the cheapest mobo was 15500, nothing left for the rest of the system. Let me know if there is something else locally.
PCPartPicker part list:
https://pcpartpicker.com/list/9Tj8RG
Price breakdown by merchant: https://pcpartpicker.com/list/9Tj8RG/by_merchant/
CPU: Intel - Core i3-6100 3.7GHz Dual-Core Processor (Galaxy $12800.00)
Motherboard: Gigabyte - GA-H110M-H Micro ATX LGA1151 Motherboard (Galaxy $6500.00)
Memory: Corsair - 4GB (1 x 4GB) DDR4-2133 Memory (CZone $6000.00)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (CZone $5350.00)
Video Card: Gigabyte - GeForce GTX 1050 Ti 4GB Video Card (Galaxy $23500.00)
Case: Corsair - 100R ATX Mid Tower Case (Galaxy $5500.00)
Power Supply: Antec - 500W ATX Power Supply (Galaxy $5400.00)
Total: $65050.00
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-20 10:24 EST-0500
https://www.czone.com.pk/memory-module-ram-desktop-ddr4-memory-corsair-value-select-memory-%E2%80%94-4gb-1x4gb-ddr4-2133mhz-cl15-dimm-cmv4gx4m1a2133c15-pakistan-p.3897.aspx
https://www.czone.com.pk/hard-drives-desktop-sata-hard-drives-seagate-barracuda-st1000dm010-1tb-hard-drive-bare-drive-pakistan-p.5079.aspx