Looking to get a trustworthy Mercury 20 HP 4-stroke motor? Understanding the existing price scope can assist you money. New Mercury 20 HP 4-strokes generally cost between $3,500 and $5,500, based on accessories and dealer markups. Pre-owned Mercury 20 HP 4-strokes frequently sell for $2,000 to $4,000, influenced by state, time and general state. Ke