Wheelchair scales (Bexhill, TN40)

Total long shot but I work in a care home where we have to weigh the clients weekly, we have a new chap come to live with us and he is in a wheelchair. He can stand on scales for a very short time but it's uncomfortable for him and not ideal due to the possibility of falling and injuring himself and staff. Ideally we would use a pair of wheelchair scales but he can't afford them and the company won't buy them. Does anyone have a set that are no longer in use and tucked away somewhere, it would be soo appreciated if someone out there did and make everyone's life easier especially his. Like I say it's a total long shot but you never know!