I haven't been tracking them for awhile, but in 2009-2010 it seems that Elixier of Life in very good condition was in the $250 (F), $255 (
VF), $288 (some spine wear, corner bumps, staple rust), $500 (slight wear on corners)
in 2009, Forgotten King went anywhere from $183 (some spine wear, small fold) to $210 and $216 (
VF) and one even went for $315 (
VF?)...I have no idea why on the last one. That and the $500 dollar Elixir were both sold by hdragonsna ebay seller, if that rings a bell for anyone.
Hope that helps!