I've installed a bot that scans eBay auctions on an hourly basis and posts its findings in this thread.  The bot is attempting to find class 4 and 5 rares, but will occasionally turn up something unrelated or not rare -- most likely due to keyword spamming on the part of the seller.  If clutter persists, I'll attempt to adjust the innards in order to filter it out.

Enjoy, and hopefully Auction Hunter finds something you missed!

Foul

P.S.  If you notice a poorly-rated seller's items popping up here, please let me know so I can filter them out.

  AD&D Fighting Wheel

$549.99  (fixed price)       Buy It Now   Seller:  dvergrp   Estimated Values   FR $80     GD $145     VG $193     FN $241     VF $289     NM $322

  Dark & Hidden Ways

$135.00  (fixed price)       Buy It Now   Seller:  ctr_pr   Estimated Values   FR $22     GD $39     VG $52     FN $65     VF $77     NM $86

  Dungeon Masters Guide 1st or 2nd Alpha print

$500.00  (fixed price)       Buy It Now   Seller:  denstr-2810   Estimated Values   FR $112     GD $201     VG $268     FN $335     VF $402     NM $447

  Dungeon Masters Guide 1st or 2nd Alpha print

$799.99  (fixed price)       Buy It Now   Seller:  dvergrp   Estimated Values   FR $112     GD $201     VG $268     FN $335     VF $402     NM $447

  GW Dungeon Floor Plans

$60.45  (fixed price)       Buy It Now   Seller:  area51.bristol   Estimated Values   FR $55     GD $100     VG $133     FN $166     VF $200     NM $222

  Jade Hare

$629.99  (fixed price)       Buy It Now   Seller:  bonk!   Estimated Values   FR $211     GD $379     VG $506     FN $632     VF $759     NM $843

  Original D&D Set

$950.00  (fixed price)       Buy It Now   Seller:  sheishannah

  R1 To the Aid of Falx

$649.00  (fixed price)       Buy It Now   Seller:  packripper   Estimated Values   FR $222     GD $399     VG $533     FN $666     VF $799     NM $888