how to get different maps for halo 3 for 360?

[Regina]

i want to play in some cool places

 

[360-Dude]

hey girl i will give you some of my halo 3 maps thats if you are a nice person and would love to play halo 3 with me on xboxlive give me your gamertag and i will send you a friend request

 

[--Sketcherandl33t--]

first you have to be connected to xbox live and go to xboxlive marketplace go to add ons find halo 3 and buy the maps (they cost microsoft points)