Decent oil, good air filter, new oil filter with washer, do you need plugs? Brake pads? Brake, clutch and steering fluids?Scoobyworld and scoobyparts are a good place to look for ideas and prices. Maybe have your gearbox and diffs flushed and refilled? Have you had your air-con recharged?
I use Miller oils. At the moment I have their CFS 5W40 in and that cost £41 off of e-bay.