Flea markets. I got a Utica torquer for $25. It's a $400 tool! Don't go crazy like I did on the MB special tools because a lot of them are not absolutely required. I bought the $50 27mm deep socket from Samstag only to realize I could have had one for much less from Sears or for 50 cents from the flea mkt. Would have done the same job.
One really useful special MB tool that isn't terribly expensive is the special feelers. Makes valve adjusments a lot easier. The Hazet wrenches are worth it IMHO if you can find a deal.

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