100K service for my 34 came in around the 1k mark. Sourced my own parts to cut cost ie: Genuine Nissan Waterpump, gates belt, tensioner and idler bearings, seals. Labour was about the $500 mark which included replacing all fluids, filters, radiator flush etc..dropped my car in the morning and was completed same day in the afternoon.
Things to note: Always pre-book your car in and make sure they know exactly what they have to do. Source your own parts to cut costs, workshops will always charge a margin if they buy the parts. Confirm how long it will take and also costs so you don't have any nasty surprises when you pick your car up. It shouldn't take 3 days for a 100k service.