First, don't pay it yourself!
With WFH and the reduced costs of office space, commuting benefits and serving you food on Fridays, employers have budgeted for WFH supplies. You just need to ask. Do not be afraid to ask HR, they won’t care - it is like $100 max, and you are in pain or discomfort. They do not want you to take days off for that, or to sue. You need this to do your job without difficulty.
Work may ask for a doctor’s note. If so, after they ask, schedule 1 session with a Physical Therapist or Occupational Therapist to get this note.
The co-pay is worth it, because you’ll get a consult, specific exercises to remedy your thumb, hand or wrist condition, AND your work will pay for these products. Just be sure to keep the receipt!
If you do not want to go that route, you may also pay via your HSA or FSA.