I made one out of wood.
It rests on my "Snapit" cupholders on one end and has a single hinged leg that rests on the cockpit deck on the other end . The height is adjustable and I may modify it by making a longer leg that angles back to attach to the steering pedistal. When not in use, the leg folds up underneath and the whole thing comes off and goes in the lazerette.Not very hi-tech but I,ve only got $25 in it and it works fine.I'd send a picture but for some reason, I can't get the site to give me that option anymore.If you are interested and want to provide an e-mail address, I'll take a picture this weekend and send it to you.Bill