How much can I build this for?

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($262.00 @ CPL Online)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($69.00 @ CPL Online)
Memory: Crucial 4GB (1 x 4GB) DDR3-1600 Memory ($39.00 @ Centre Com)
Storage: Toshiba 1TB 3.5" 7200RPM Internal Hard Drive ($65.00 @ IJK)
Video Card: EVGA GeForce GT 710 1GB Video Card ($58.30 @ Newegg Australia)
Case: Silverstone PS08B (Black) MicroATX Mid Tower Case ($39.00 @ Storm Computers)
Power Supply: Silverstone 300W 80+ Bronze Certified SFX Power Supply ($65.00 @ PCCaseGear)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Operating System: Microsoft Windows 8.1 OEM 64-bit ($139.00 @ Mwave Australia)
Total: $736.30
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-11 20:50 AEST+1000

They didn't get ripped as bad as you might think stuff is expensive in Australia, and this is with no mouse/keyboard/tech support/DVD burner/memory card reader. None of that is real expensive just was surprised a build that weak was that high in au
 
Solution
print this out and give it to his parents. the hp and dell pc are fine for work and light web and word. the issue becomes when you want to game or upgrade. the units size now is so small that most standard gpu wont fit. also the units have under size power supply that have to be replaced if a updated gpu is used. some of the vendors used to make there own power supply and mb and you were stuck with there spare parts. home built pc your going to have better parts and most retail parts going to have longer warranty then hp. down side is your the repair person if the pc dies.
with home built your buying better parts.