I still have a few miniatures from my college D&D days. I never had the army of miniatures to fill a dungeon, just a few to represent the party. Here is the link to my lead miniature collection page on my main site Fantasy Lead Miniatures.
ttp://groups.yahoo.com/group/gamingminiatures/ - Yahoo Gaming Miniatures Group. A group for those who are interested in collecting Adina, TA-HR, old Citadel, Dragontooth, Grenadier, Ral Partha, Heritage, Minifigs and other fantasy/sci-fi/historical figures of the late 70's and 80's. Figures wanted/for sale posts are welcome.
http://www.solegends.com/index.htm - Stuff of Legends. A monster site of miniatures. Look for Ral Partha miniatures.
http://www.collecting-citadel-miniatures.com/wiki/index.php/Fantasy_Specials_-_FS - The fantasy specials collection from Citadel.
http://www.megaminis.com/ - Mega Miniatures. An ebay store specializing in lead minis.
http://www.dndlead.com/ - DnD Lead a fan site.