I only saw ONE box of RoS Boosters at GenCon, they wanted $150 for it.
Not bad actually, considering it's pretty much the Coruscant of LotR and if this game ever gets back on its feet like SWCCG, then that will easily shoot up to $300+, with Hunters probably going for $250+ and T&D going for $225+.
And as for "will Decipher print Shelob's Lair and The Great Eye?"...
...sigh.
No, Decipher does not have either the license for the property nor the manpower to make that happen. They've barely got the resources to launch FightKlub, and, not to be negative, if that flops, so probably will Decipher.