i'm happy as a ___________

any way i had to use my on-board fire extinguisher last season and it was going to cost $600+ to refill it. so being a bucks down kind of guy i waited and waited to see what was on e-bay. well this one came on and i won it for $66 + $25 to ship, it's brand new in the box. it needs a discharge head for $62 including shipping and it's already on the way here. BUT when i check the new 10lbs bottle price it was a whopping $495+shipping. so i'm as happy as a __________, fill it in.