There are a few ways to get a command block on Minecraft Xbox 360. The easiest way is to use the console command “net.minecraft.command_block_utils.command_block”. This will give you a command block that you can use to control your Minecraft world. Another way is to find an old minecart with the “useitem” command and place it in a position where you want the block to be, then use the “setblock” command to place it there. Finally, you can use the “giveitem” command to give someone a block of that type.