hmm, i buy everything, + big box, puts everything in there at night, and in morning, OMG! my shiny new PC manufactured! Amazingggggggg
well obviously people buying their products built themselves. and cost depends on where are you buying from?
its better you get free training from a PC builder. in tools, you wont be needing any else than philips screw driver - thats it
as there is caution of static electricity, therefore I'll recommend watch someone (a propoer technician) for some days (work voluntarily at some PC building shop), and u'll learn much