axles axles axles axles axles

welll... this might b a stupid question but i need to ask it ne way. i may not even b able to get an ansewer but... lets say i need a new rear axle.. and im gonna put 4.10s in it and the front d30....where would i go to find a good axle...d44 or sumthing else thats gonna hold up to 33's (ford 8.8??) and how much can i expect to spend? used? new? junkyard? im pretty much lost about price and where to find one.. please help thank u much