Regular game: $50
Each addon: $20
Premium (allows you to use vehicles, save and load builds, and play multiplayer): $100 per month
$30 each time you edit your blockhead
$40 for a forum account
$75 for forum premium (allows you to edit posts, quote posts, post links, post pictures, see avatars, have an avatar, create polls, vote in polls, and unlimited posts per day whereas regular account only allows 5)