Dell computers at a special price and additional services

We have two devices: the large one and the small one. Specifications: Both have 6th generation i5 processors. Both have integrated graphics cards. Both have 8GB of RAM. Storage: The large device has 256GB SSD + 500GB HDD. The small device has 256GB SSD only. Additional services: Installing Office programs. Installing Windows 11 or 10 with a license key. Adding extra storage space. Adding a dedicated graphics card. Purchasing a mouse, keyboard, and monitor. The large device is 550. The small device is 500.