Dave - I've investigated several programs for my uncles and parents and have never heard of anything specifically related to incontinence or the cost of pads/adult diapers etc. This comment has some ideas for looking into what's available in your area, copy and paste it into your browser or search "incontinence" on this site.
See if your state has a medicade waiver program. They go by your income. I got my mother on it and she gets help with bathing and home care. She also gets meals on wheels 5 days a week and also free bed pads and pull ups or diapers for adults. Call the human services in your area and they can direct you. I do know they go by your income and disability. It is worth a try. Good Luck
https://www.agingcare.com/104574