Amazon America currently has LEGO Castle Dragon Mountain on sale for $37.99 (reg.$49.99). As always, free shipping and no tax for most states on orders above $35.
They also have Castle The Gatehouse Raid back on sale at 30% off for $20.99 (reg.$29.99) if you missed it last time. LEGO Star Wars Jek 14 Stealth Starfighter is down to $55.99 (reg.$69.99) which works out to be 20% off as well. More of their hottest LEGO deals can be found here.