ALPHA SHOOTING SPORTS
these guys sell decent barrels for pretty good prices if you want a stripped barrel. you will have to notch the barrel for the front sight pins if you not going to run a bolt on gas block and use the GI front sight base.
-D S Arms
JSE and DSA sell finished barrels of several types and brands, chrome and no chrome light weight-Hbar and so on. by finished the barrel has the front sight attached.
that DS arms 16" nitrited m4 barrel is one of the best buys out there for $159. the nitride is a mil-spec finish for the outside and the inside of the barrel. super hard and tough.
sometimes midway USA has some deals on barrels as does brownelles
DS arms -- also has a 20" fluted i have been lusting after with 1-7" twist rate. where is my wallet?LOL!