The Nap two blade spitfire was one of the first they made. they discontiued it and went with the three blade. So ya can't get them anymore.

The shockwave works as good or better than a spitefire for less money.
the size of the blades hasn't got all that much to do with it anyway, the arrow placement has everything to do with it.

I get really heavy blood trials when I get a good placement through the vitals and a low exit hole. doesn't really matter what broadhead I use.