Filter: eBay you can get some good multi buy deals.

Oil: I normally use 10w40 from hein gericke as I bought 6 big canisters when they where on offer and only just finishing them off. After that I'm basically back to the halfords stuff again.

Cush drive rubbers: only ever bought them from yamaha once as I normally packed them out. might have a look at wemoto myself.

oil for chain: Normally used scot oil as I've always had scot oilers, but once the bottles run out I use old engine oil which I've tons of. Buy some cheap tooth brushes, wee bottle filled with oil and an old rag is all you need really

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Plough on