With a nice find on eBay, I have just completed my white box D&D set:
That's the new addition in the bottom-right hand corner - Supplement IV: Gods, Demi-gods, and Heroes by Ward and Kuntz.
I originally picked up Blackmoor and Eldritch Wizardry for a few bucks apiece at a tiny basement gaming shop at - IIRC - the Bergen Mall. I bought it because they were for D&D, and this was when I didn't have any idea about different editions. I picked up Car Wars (and Truck Stop and Sunday Drivers) and Ogre from that shop, too, along with most of my Grenadier miniatures boxed sets. Anyway.
I got the LBBs a while later on a whim from The Mail Order Hobby House. IIRC it's the collector's edition.
Greyhawk I got in the 90s from somewhere else - I can't remember where.
Finally, my Supplement IV arrived in the mail today.
Now all I need is Outdoor Survival and Chainmail to make it a playable game. Heh.