Hey alzebra,
If you look at the part# it will tell you if it's a retail boxed chip. For instance the Duron700 they have for $119 is part#-D700BOX, "BOX" meaning retail boxed.
I have bought chips from them many times before, and that's how they are listed. Also, I have never had a problem with Buy.com, and I think they are a very good company.
As far as locked or un-locked.......just a chance you take I guess, since some people have said they have recieved both kinds from them.
GOOD LUCK!