I just found a post with a mention about the "Airhawk pneumatic seat cushion" which Googling returns:
http://www.therohostore.com/Departments ... hions.aspx as the place to get them.
Anyone have one and are willing to post your thoughts on it?
What size do you have?
Is it the "Airhawk" or "Airhawk 2" ?
If it does what is says it does, the "Airhawk 2" doesn't look to bad for the price.