4x4 Parts

Does anyone know where I can get some cheap 4x4 parts for a 1988 chevy silverado k1500? I need a front driveshaft and a front ouput shaft coming out of the front differential that meets with the axle shaft in the center of the front axle. The current output shaft is in good condition; however, the outer wall of a bearing is welded to the inside of the output shaft. I have the new bearing, but chevy wants $300 for the part.