Is there somewhere in the Library that you can directly put money on your UCard, or do we just have the guest card machines located on Main?

The UCard machine that is on the Lower Level of the Library (aka Learning Commons) can be used for both. You can purchase a Guest UCard from the machine but it can also be used to add money to your UCard (staff or student) or Guest UCard. You can use it just to get a balance on your account too.  Don't forget though it does not give change! What you put in the machine is what you get. It only takes cash, no coin or credit card.