This is a common problem. Bedside lamps, standing lamps, and desk lamps get a lot of use. Over time, cleaning, humidity, and salty air can damage the shades. So, it’s normal to replace them every 5-7 years.
The easiest way to replace them is to send a picture of your current lampshade, along with its measurements, to a supplier. They can custom make new ones for you and ship them to you.
This method saves you time from searching online, comparing sizes, and browsing through catalogs. You have a department to run, so don't worry about becoming a procurement expert overnight.
Here is a picture of a team that worked with a manufacturer to replace a shade. This is the old shade, and this is the replacement:
Many websites can make exact lamp shades for you. We've compared several and found one that's easy to work with and delivers good quality at competitive prices. If you want the contact information of the supplier we recommend, just send us a message, and we’ll be happy to share it.