We got out bus for $2K, and after a good service, driving for almost 2K miles, we came home with a wonderful bus for around $3K including fuel, food, hotel, et.al.
Look around at GovDeals.com or publicsurplus.com for some good deals. Talk to the lead mechanics about the buses you're interested in and be prepared to walk away from some. Avoid the northern buses (rust and corrosion). California buses are some of the best to get. That's where we got ours. So if someone wants $8K to $10K, the bus needs to be rust free, VERY low mileage, AND VERY low hours on the engine to be worth that kind of money (i.e. 50K miles and 4K hours or less), in other words a *unicorn*.
Hope this helps.
Firearms stand next in importance to the Constitution itself. They are the American people’s liberty teeth and keystone under independence. — George Washington