Bruno does a great job on documenting his adventures. Make sure you take some good pics!
You can find complete Thayer's Quest kits on eBay but they can run $1200 and up. You need the laser disc, pcb and control panel. I pieced mine together. I got a laser disc a few years ago on eBay. I was trying to find a SA marquee on the Dragon's Lair Project and found a guy that had one. He lived 1 mile form my house and collected laser disc games. I bought a TQ marquee, pcb and control panel for $250. That was a bargain. I also bought his Cliff Hanger (yes, a working Cliff Hanger) and his MACH 3. He delivered them himself.
The hardest part to find in the keyboard control panel. The membrane keyboard did have problems after time. If you can find the disc and pcb there is a hack you can use at
http://www.d-l-p.comThat will allow you to use a regular keyboard instead of the hard to find control panel.
You are going to have so much fun with those games. There is nothing better than being able to play those games whenever you want.
One extra bit of advice is to unplug the games when you are not playing. Plugging them into a surge protector is another good idea. I unplug my surge protectors when the games are not on. This may not be necessary but I am paranoid about anything happening to my games. I do not want to replace the power supplies.