Potty training frustrations

Potty training with Dawson is not going as hoped at our household! It seems as though we have one very stubborn son, who could care less if his brand new dinasaur "big boy" pants get ruined. Yes, I said ruined b/c - I don't enjoy the whole "cleaning poop out of underwear thing." The boy has been peeing on the potty for as long as I can remember- probably a good 4-5 months now, so why can't he just poop on the potty too?!? I guess it's more frustrating for me this time b/c Masen was so easy to potty training. He had it down at only 2 years and 7 months old and I don't remember him having any accidents. Maybe I'm expecting too much, but I sure am sick of spending a fortune on diapers!!! And yes, we've tried everything to make it "worth it" to him - candy, quarters, everything! Hopefully he'll at least have it down before he goes to Kindergarten :).