I want to change my spark plugs, but I don't have the tools set that came with my car, i think my mechanic took it when I got a oil change.

How much does a tool set cost, or what other options do i have?

I have a 87' 300e

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87' 300E champagne - Euro headlights and corners, 8-hole rims, 140,000miles/220,00km.