Brett,
You're going to get a wide range of replies to this thread. High quality broadheads can be easily found for less than $40 a head, even single bevels. I shoot Grizzly 200 grain, single bevels, and they are about $12 each. Ace Standard double bevels are a great broadhead and run about $6 each. I build my own arrows using premium grade douglas fir shafts, and I have about $130 per dozen in them (Note, I have $550 - $700 invested in a fletching jig, feather burner, dipping tubes, paints, and cresting machine). This includes spending double on wild turkey feather fletching, vs. the standard feathers. I have also seen good carbons for much less than $200 per dozen. I figure I have about $200 into each dozen hunting arrows. Barring you don't lose them, good broadheads will be on more than one hunting arrow during their life span.