See those carts up there to the right? Each gallery displays those carts and you can use them to purchase your favorite photos.
Prints in the Public and Private galleries are available for purchase in a variety of sizes ---
4x6, 5x7, 8x10, 8x12, 11x14, 16x20, 20x30, 24x36 and 30x40, wallet, and even gifts.
Print sizes vary on photo. Add an item to your cart to see the sizes available. All my photos have a lustre finish.
Make sure you check out the estimated shipping rates to maximize the number of prints in your order.
Here is a great reference for using the shopping cart.
And please don't worry about that watermark. They will not show up in your prints.