I'm finding this post amusing....the prices you guys are posting would have been what I would consider reasonable....they're more like cost of parts, some labour and maybe the cost of courier to get the part to the shop. Before you want to whinge about being overcharged, take your car to a Holden dealer for servicing, then tell me again the likes of Ultratune and other mobs around are overcharging you.
For the record, Holden will charge on average between $600 to $1200 for standard log book service. The $300 they qoute is really just putting your car up on a hoist and they haven't even started changing the oil, parts, water, filters etc.