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The Karcher K4 comes in a few different ranges and they are the Karcher K4 Compact, Karcher K4 Power Control, Karcher K4 Power Control Home, Karcher K4 Power Control Home + Car and the Karcher K4 Premium. You'll find all models here along with their best prices, cheapest options and which stores to purchase. The best stores with the best prices are Screwfix, B&Q, Argos, Wickes and Halfords. Also checkout the cheapest prices on Amazon as they often have great prices available. Homebase can be a good choice too if you can get local pickup.