where to find cheap "Shock Absorber front"?

[bosanci28]

i have the x5 4.4 2001 and i hear some clunk,cluck when passing over bumps or when making right and left,
and i come to conclusion after inspecting that i think the front (both left and right) are bad i think,plus i have about 160k miles on it,

so i have look here in there and i so that autozone may have them about 300$ each,but online i found some with 160$ here,and some with 75$ here,but not complete ,,and what do i have standard or self leveling shocks?
confuse little there..

if anyone knows where i can get those cheaper or what exactly i need,please reply with some advice.
thank you very much,

thanks