This is similar to the "mia" (Missing In Action [Figure?]) thread here in Kenner: Vintage. What's out there that you've been looking for for some time? These don't have to be figures, in fact, better to keep figures out, so the other thread can get some hits. For me...
Open-Belly Tauntaun. It's getting harder to find one without a yellowed belly (scared? ) and less than $50!
Desert Sail Skiff Mini-Rig. I don't know why, but this "not-seen-in-the-films" toy has been a bit elusive for me. I have all the other non-POTF mini-rigs except it.
You got any more?