I have one of these, very portable and the seat is self leveling, he shows up at the gun shows all over around here, paid $90 for it. Works good but lacks the room for a spoting scope or ammo. Cheap and protable and very stable.
Just a suggestion.
http://home.comcast.net/~MOA_Shooters/KnotholeDesigns.htm
He had a "Gunshow special" that included the adjustable block and two bags.
