The Ordering of almost any PC or Laptop accessory, not placed with your original PC or Laptop purchase, can be done by visiting the following websites:
CDWG This website will provide you with an extensive amount of accessories at State Term Contract pricing.
Newegg This website is a general consumer website offering PC and Laptop accessories.
Crucial This is a good website if you are interested in purchasing computer Memory (RAM) and/or extra disk drives.
You can purchase any items from these sites and submit payment per your departmental policies. The orders can be shipped directly to your office, thereby expediting delivery.