magento extension "order sample"2

i need a magento extension needed to allow my clients to order a sample. so the add to cart, button is also there. i sell fabric. sometime, i want to allow client to order a sample of a particular fabric. so on those specific products i want an additional button that says "order sample", and when they click it, it will add the "sample" to the cart for $2. when i click add sample, i would prefer a ajax box to appear, for 3 seconds, to say SAMPLE HAS BEEN ADDED, and disappear after 3 seconds. I need you to buy and install an existing module, or create a new one.