Servers are free to get and set up. Simply download it from minecraft's home page. The link can be found under "Sources and related links".
However, you will need to purchase a premium account to sign in to your server, unless you set the flag "online-mode" in your server.properties to false.
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It does not cost anything to get a minecraft server. You simply download the Minecraft_server.exe from the minecraft website download page. Then, you run it to make your own server.
nothing its free
A dedicated Minecraft server is a server where you can play original Minecraft. Usually without plugins or mods.
Depends on your server host.
Minecraft 1.2.3 is a game version, not a server.