i speant about 250$ -=without video card/monitor=-
on a t-bird 1.2 ghz, a bit of ram (had some useable pc100 stuff laying around) and an abit kt7a - a new case/ps
this was 2+ years ago.. your getting riped off if you pay more...and no i didn't buy it off the net .. got it from loacal dealer (not compusa, bestbuy etc.... i mean, a real guy ... mom and pop .... you know real people)
and if you don't know how to build a computer .. learn ... it's as easy as pluging in your DVD

... almost.
in this day and age I wouldn't pay much more than 100-130$ for a mobo or chip unless it's top of the line .. and you don't need 3.xGhz I imagine.... 1-2.x Ghz will do just fine... just be wise on your chipset choice