So, GOG.com is doing a Christmas sale until January 3rd. There are a lot of pretty good deals (including Duke Nukem 3D for free!), but the relevant one here is King's Quest.
If you've never played the King's Quest series before and want to know just what Telltale's going to be handling in the future, GOG's three bundles are on sale for $5 a piece, or $15 for the whole series.
Thought I should let you know.