There is a wide range of prices for Iwata 400 spray guns, depending on the model and where you buy them. According to the retailer and any special promotions or discounts available, the Iwata WS400 Evo spray gun can cost anywhere from $600 to $800 or more. The price of Iwata LPH400 LVX ranges from $500 to $600. Supernova LS400 are also popular models for clear coat applications and can be found for $600 to $750. The best way to get a good deal on a specific Iwata 400 model is to check out various retail stores or online stores.