I have not yet needed their services myself but, I do know that here in Massachusetts the state department of rehab & disabilities has all kinds of available services related to independence, in-home care and assistive technologies. They have a specialized department that deals with grants to cover the cost of all kinds of needs and equipment.
If you are unaware of such a department in OK, you might want to google OK rehab/disabilty services or Tulsa.gov or something similar.
Hope this helps....Best of luck.

gracie