Trolley Buses ( rubber tires) and pre-determined routes, but no tracks, are still in use in a variety of European cities, and for some reason were and are very popular in the Former Soviet Union, sometimes articulated for greater capacity. there are rumors the Swiss (flywheel) or motor-generator trolley buses, which were very scientific in using motor-generator sets to keep the ball rolling, as it were and required recharging only at special charging stops, thus dispensing with continuous catenary or Overhead as it is also known- they had three prongs on the retractable power pick-up and were widely written up around l954 in Popular Mechanics-type magazines. I do not know if these energy-wise vehicles are still in service.
In Scotland, you can find various types of transport options including trains, buses, trams, ferries, and taxis. The train network connects major cities and towns, while buses are more extensive and cover both urban and rural areas. Trams are available in Edinburgh, and ferries are used to travel to Scotland's islands. Taxis are also widely available, especially in urban areas.
Wikipedia provides information about the history of trams. One can also look on Railpage, Yarra Trams, and Groundwork East Midlands for information about the history of trams.
Here is a pretty cool looking trolley bus. I am not sure your price range, but this website has a lot to offer: http://www.bargainbusnews.com/Buses/2482-1990SpartanTrolley/
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You can find trams on any tram network, when it is open. Tram networks are in many major cities, such as Sheffield and Manchester.
One can purchase buses in Canada from Major Vehicle Exchange a dealer of used shuttle and wheelchair bus specialty. They also sell shuttle buses, tour buses, used and new buses.
On a bill board
You can find buses for sale at carpenterbus.com, or you can find them at absolutebus.com. Also, thebuscenter.com. All these provide many busses at affordable prices.
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Ebay or Craigslist, maybe? a-zbusused.com has a lot of used buses for sale. I'm not sure if they will sell to private owners or not. 50000trucks.com has school buses.
There are many different places you can find buses for sale. You can look in the classified section of your newspaper or you can go to websites such as Best Bus Sales.
A person can find up to date schedules for Greyhound buses in Houston by checking the Bus Today website. They always have up to date schedules posted.