Kia does show a belt for non-ac Fortes...maybe up North you could check wrecking yards, however you'd probably spend as much as a new clutch/pulley assembly:
The sound may be the clutch/pulley bearing - so replacing that might stop your noise.
I just have never seen a non-ac Forte - so I have no idea how they set up the serpentine belt pulley system.
Are you sure it is the compressor making noise - and not an idler pulley?
If the compressor IS making the noise have you disconnected the wires to the clutch to see if that would shut it up?