update multiple products at once

Hi- do you know of a way that I can update multiple products at once? Not all of them, but specific ones, maybe belonging to a specific category... I need to add that they are no longer available and out of stock - I don't want to delete the products, but need a way to update multiple products at one and not have to click each one to update it. Please tell me there's a way... LOL - NOTE: i only use marketpress for products only , NOT THE CART.. so I don't use the real stock feature...