I would first want to know which country you live in (at least, city would be helpful too). Assuming you are in the western hemisphere I would recommend consumerreports.org. I personally have several family members who swear by this site.
Not Lego halo but there are halo megablocks sets.
No, Lego Halo does not exist.
halo recon does not exist.
Lego Halo does not exist.
Nobody, LEGO Halo doesn't exist.
Halo 5 does not exist retard,although there is HaloWars, and Halo ODST coming out soon.
Lego Halo does not even exist.
Halo 4 is called Halo 4.
The map, Foundation, does not exist in Halo 3 and is only available in Halo 2.
not yet
no
The gravity gun is from the Half Life series, not Halo. This is unobtainable and does not exist in any Halo game.