Depending on the age and wear of the '97 springs, you'll probably get about 1" - 1.5" of lift. Like awpsome said, make sure it's a killer deal.
Just to give you a frame of reference, Camelback Toyota has brand new springs from a '99 4wd for about $200 (and I believe it's free shipping). Those springs will get you about 2.25" - 2.5" of lift.