Not under $800 but pretty close.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | AMD Athlon X4 860K 3.7GHz Quad-Core Processor | $93.29 @ Newegg Canada |
| Motherboard | Gigabyte GA-F2A68HM-H Micro ATX FM2+ Motherboard | $44.99 @ NCIX |
| Memory | Crucial 8GB (1 x 8GB) DDR3-1600 Memory | $35.73 @ DirectCanada |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | $60.25 @ Vuugo |
| Video Card | PowerColor Radeon R9 285 2GB TurboDuo Video Card | $298.00 @ Vuugo |
| Case | Rosewill RANGER-M MicroATX Mini Tower Case | $44.98 @ Newegg Canada |
| Power Supply | EVGA 500W 80+ Bronze Certified ATX Power Supply | $46.99 @ NCIX |
| Monitor | Asus VS228H-P 21.5" Monitor | $146.22 @ DirectCanada |
| Keyboard | Logitech K120 Wired Standard Keyboard | $8.98 @ NCIX |
| Mouse | Logitech B120 Wired Optical Mouse | $7.98 @ NCIX |
| Headphones | Creative Labs Creative Fatal1ty Headset | $41.16 @ Amazon Canada |
| Other | Ethernet Cable | $7.99 |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $856.56 | |
| Mail-in rebates | -$20.00 | |
| Total | $836.56 | |
| Generated by PCPartPicker 2016-05-13 20:17 EDT-0400 |