In the past I have been able to buy a two piece boot and put it over the old one for a temporary fix
Because to replace just the boot you would have to take off the same amount of things to replace the whole axel itself. And it's not much more expensiveWow $50 I paid $20. And why would he have to buy a whole new axle? He didn't say it was bad?
If you want to remove it the rest of the way remove the lower ball joint nut, pop the ball joint out of the knuckle, remove the 34 or 35mm axle nut (I forget the real size), then smack it with a hammer to free it and allow it to move. Then swing the knuckle up and away to slide the axle shaft out of the bearing. You either need a pry bar or a slide hammer to pop the axle from the transmission because there is a pressure clip you need to pop it past inside the transmission. Put a rag or a small bucket down as you might lose some fluid.