Prices tend to vary greatly. Yes they do see the links below. Manuals are widely available from rowe-ami, seeburg, rockola etc. Several companies specialize in complete manuals and schematics. Off the net, at shows, and from delaers and operators.
Older parts are often expensive.
Very few stores carry them any more. Bigger cities sometimes have record stores that do however. In additttion operators may be willing to sell you records they have taken off location. Some sites on the net offer records for sale. Typical price is about 2.50 - 3.00 each.