Window well covers are available at home improvement stores, such as Home Depot or Menards, or online at general retails, such as Amazon. Local hardware stores may also have window well covers, depending on your area.
When buying a window well cover, first check the size of the window well. The cover also needs an anchor to stay in place, either by caulking to a flat wall above the window well or drilling holes for bolts. Verify whether the window is fairly level with the window well top, allowing for a flat cover, or requires a raised cover to provide complete protection for the window area. The style and price can vary considerably, so having a plan before purchase helps save expense and work later.