They are easy to find , and prices for new will range from $650 or so to as much as you want to spend . Rock River , Bushmaster , and Stag are all mid level priced and seem to all be good robust rifles .
Edited to add : on re reading the op its about Colt , and yes they can be hard to find and spendy . your looking at 1200 + to get the pony if you can find one . A dealer on another board just got some in but i am unsure if he sold out or not .