Greyhawk Collecting

I've been idle for the last week so today I thought I'd muse aloud about what out of print Greyhawk material I still need to finish my collection. I know many things can be had on PDF nowadays but part of the joy of being into a hobby like D&D is collecting classic hard copy books. Beyond books there is a ridiculous amount of Greyhawk stuff out there, cards, minis, magazines and so on. No one could possibly get all of it. For me, modules and sourcebooks is what I've been keeping an eye out for, mainly at conventions like Gen Con. I don't do Ebays or Amazons because part of the thrill is hunting and finding them. I'm not above trading with others though so if any of these can be had let me know!

N1: Against the Cult of the Reptile God I really want this one. Not sure how it's eluded me to this point.
L2: Assassin's Knot Another one that I'm sure is easily had, but somehow has evaded my grasp.
I7: Baltron's Beacon I could've swore I had this one but I'm not seeing it on my shelf.
Return to the Tomb of Horrors This is a boxed set adventure but still one that I'd like to get someday just to see what new death traps they came up with.
WG9: Gargoyle and WG11: Puppets Not necessarily cause I want to run them or even read them. Just to finish the collection!
WG12: Valley of the Mage This is the big one. How do I not have a physical copy of this sourcebook?
WGA1 Falcon's Revenge and WGA3: Flames of the Falcon The odd thing is I do have WGA 2: Falconmaster. How does that happen?
WGQ1: Patriots of Ulek I don't have this but I need it for the collection. As I recall I was underwhelmed with the direction of adventures at that time and may have chose not to buy it when it was first released.
WG7: Castle Greyhawk I have resisted the temptation to get this joke dungeon so far. I did buy a PDF copy of it for comic strip reason years ago, but the hard copy may have to wait till last...