What are you looking to pay per mile? There are several people who do this type of thing, my husband has done it. Since a bus is so large, you’ll need to have it freshly serviced and drive able, you’ll also need insurance already on it for liability. If the title hasn’t been changed already to a motor home, then you will pay more for a driver who will have to have a CDL. Then have a payment arrangement worked out ahead of time. You should call a logistics company and see what a professional service would charge and then you’ll know about you are looking at.
My guess is that you’d do better buying one from a place that can deliver and roll the fee into the purchase.