The term shopping a pin has been discussed on here a few times.
Can vary greatly from person to person, business to business.
Its a great experience to do it yourself and just requires some patience and elbow grease. If you have a digital camera - that is the best way to start by taking as many photos as possible. Strip the playfield of the major furniture (ie plastics, posts, ramps etc), nifty on a rag, novus 2, 1 and canubra wax.
Replace blown globes, new rubbers, check flippers and put a kit through if required.
If you're not confident to do it maybe email MarkC or PinballFixers (Owen) and get an idea of price.
For me I can spend anywhere between 10 to 30 hours shopping a pin.