It depends on where you are. It seems that most people here can get them dirt cheap compared to the prices I get locally. In my area, the only way you'd ever find a 16 inch aro (DE or not) for under $100 would be if you found someone who's pretty desperate to get rid of theirs. I paid over $40 for mine when it was around 5" and already developing DE, and their price has gone up quite a bit since then. I've been to two different stores in the past year that were selling 6-8" aros for $100+.