I paid $140 for 20% w/ a lifetime warrenty. For a good tint job expect to pay between $120-$190. I wouldn't go cheap if I was you. You'd hate yourself later on when your tint starts to turn purple and bubble up.
My ride(Cardomain link) :
'95 Contour 16V Zetec DOHC,
Teal , ATX
Born on Sep. 4, 1995
86+ miles
*LEDs mods are on their way!*