My husband looked all around for those, he went to a medical supply store and got one but its not very good. Walmart.com has a good one but I didn't want to wait for it.
Before the surgery we had a double trash bag, rubber band and duct tape method that worked well, its just now not being able to put any weight at all on the leg is what worries me but I got the lawn chair so I will give it a try today.
Thanks for the help.