Price ranges are depending on how much you are selling or what the other is willing to pay.
what i would say:
def 0.04 - 0.06
att = def
spd 0.03 - 0.04
wis = spd
vit = spd
dex 0.02 - 0.03
att = 0.07
def = 0.06
spd/wis/vit = 0.04
dex = 0.03
life = 0.2-0.22
mana = 0.1-0.12