A Mercedes-Benz GL 450 averages €12,499 across all model years, with the cheapest sitting around €12,499 (typically older years) and the priciest around €12,499 (recent years). The median is €12,499. A good price for a Mercedes-Benz GL 450 is under €12,499; anything over €12,499 is on the high side compared with similar listings.