Yes, that is an available option. Our extremely flexible service allows you to have cards done just about any way you want them, including having slots punched into the top.
Another option is to use badge holders for ID cards. These significantly prolong the life of the badges and protect the cards from other environmental hazards. They also allow for more surface area for printing and graphics. A selection of standard badge holders are available for order on our accessories page, along with lanyards, clips, etc.