The airhawks are hand-made by repeatedly dipping a form into a very special neoprene -- hence the cost. Owners seem to find the quality of the product to be impressive. An Airhawk will stay where you put it, so you don't have to strap it on if you don't want to. The instructions call for the airhawk only to be inflated to where your butt is 1/2" higher than "bottoming out." Consider that when calculating whether it really will make you not be able to flat foot or not.
Currently, Cyclesaddles charges $148 TOTAL = free shipping.
Currently Derby charges $130+ 16.95 (to my zip) S&H = $146.95
At the Derby site, to find out your shipping charges, put something in the shopping cart, "complete order," and just put your zip code in and at the bottom of the page hit VERIFY ORDER. That's how you get the complete cost. It's a very awkward way to serve the customer, but that's how you do it.