This should be more than enough for a DIY build to run emulators and such:
PCPartPicker part list:
https://pcpartpicker.com/list/XRFPkd
Price breakdown by merchant: https://pcpartpicker.com/list/XRFPkd/by_merchant/
CPU: AMD - Ryzen 3 2200G 3.5 GHz Quad-Core Processor ($91.99 @ Walmart)
Motherboard: ASRock - B450M PRO4 Micro ATX AM4 Motherboard ($59.99 @ Newegg)
Memory: Patriot - Viper 4 8 GB (2 x 4 GB) DDR4-3000 Memory ($55.98 @ Newegg)
Storage: Crucial - MX500 250 GB 2.5" Solid State Drive ($49.85 @ OutletPC)
Storage: Seagate - BarraCuda 1 TB 3.5" 7200RPM Internal Hard Drive ($43.39 @ OutletPC)
Case: Thermaltake - Versa H15 MicroATX Mid Tower Case ($36.08 @ Walmart)
Power Supply: Corsair - CX (2017) 450 W 80+ Bronze Certified ATX Power Supply ($16.00 @ Newegg)
Total: $353.28
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-02-10 10:53 EST-0500
It's using the on-board vega graphics instead of a GPU so that saves quite a bit of $ in itself. Agree with Ryzen CPUs they absolutely perform close enough to Intel to justify unlike the older FX series, and with their high-performance Vega graphics on-board Intel cannot even compete. Which PC were you looking at?