I found the chicken weapon in the Northern Tundra, where the guy who wants the gauntlets and has the golden sword is. I forget the name of either him or the "blacksmith". There were a lot of chickens running around there. Try shooting them, it's funny. *evil grin*
I didn't find the Armour of the Order, or the Bow of the Order until the very last level when I was running around/flying around thinking "how in the world do I kill Jasaad!". But have since replayed with the Armour being purchased first.