Or possibly in the works with: The Secret of Monkey Island, Monkey Island 2, Day of the Tentacle, Full Throttle, Sam and Max, and Grim Fandango? I haven't played any of these games and since very few stores sell used PC games finding them is near impossible.
I don't think you'll find them all (legally) on 1 CD, but you could get collections for something like $20 at one time from the LucasArts Website. I have a feeling that they've finished with that now. To get all those games would probably require you to purchase 3 of the LucasArts Archives, but I don't remember which ones. I believe there was a Mega Monkey Compilation, and a collection (which I bought, despite already having Fate of Atlantis) with Day of the Tentacle, Sam 'n Max, Indiana Jones & The Fate of Atlantis, Rebel Assault, and a Demo CD.
All this may very well be of no use to you now, if you cannot find these collections anywhere.
Yeah, they re-released them a while back, except for the earlier Monkey Island games. You can probably grab them off eBay or Amazon.
http://www.amazon.com/Sam-Max-Road-Tentacle-Bundle/dp/B000AV3GIC
http://www.amazon.co.uk/Lucas-Classic-Line-Sam-Max/dp/B00005Q6XJ
http://www.amazon.co.uk/Lucas-Classic-Line-Grim-Fandango/dp/B00005B4P5
http://www.amazon.co.uk/Lucas-Classic-Line-Full-Throttle/dp/B00012CTJW