I've noticed that too, Kevin. Who knows the answer if there really is one as to why these are going for such a low price. I noticed a SLer go for under $700...a common for $355 and Tinker went for under 1K
Looks like the time to buy is now for SGC 84's!
Edited to add: It seems like SGC has sold more 84's recently than PSA has. PSA's prices seem to be on a little bit more of a roller coaster.