How much would a used 1998 Audi A4 motor cost?

i might need an engine for my 1998 Audi A4. How much would that cost me for a used one?How much would a used 1998 Audi A4 motor cost?Which one, 4 or 6 cylinder? Recently I bought a 2.8 for my 98 A6. It was 1300, 300 for installing new water pump, timing belt, cam seals and head gaskets (why not do that stuff while the engine is not in the vehicle), 77,000 miles, 200 for shipping.

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