I am so sorry about your son. Go to the Search heading in the blue tool bar. Type in Bed. You will find a wealth of options there! We used an alternating pressure low air flow mattress on a fully adjustable bed frame. This bed changed the pressure on my husband every two minutes. It was comfortable and prevented bed sores. We had an Invacare lift that I used to transfer my husband to a reclining chair every day. This position change helped with discomfort, too.
Be sure to post questions to threads that deal with the question or, start a new thread (top left of the different forum pages). It takes awhile to navigate the site, but you will find so much information here.