The 7th Guest is $3.99 on today's Classic Gem Promo on GOG.com. Here's a direct link for regular customers:
http://www.gog.com/gamecard/the_7th_guest
But if you've never bought from GOG.com before, consider using this affiliate link to support the ScummVM project:
http://www.gog.com/en/frontpage/?pp=22d ... 477c95c23d
The 7th Guest 60% off on GOG.com
Moderator: ScummVM Team