250 GP Elixir of thundering voice +10 Intimidate competence for an hour (ACG)
4,000 GP Cloak of the Yeti +2 Intimidate competence, Endure Elements (Cold only), +1 Natural Armor Bonus (Reign of Winter)
1,000 GP+ Feral Mutagens +2 Intimidate competence (APG)
3,500 GP Ring of Eloquence +2 Bluff, Diplomacy, Intimidate competence wild speech in 4 languages (ACG)
3,500 GP Maiden's Helm +5 Intimidate competence, Command 3x/Day (Shattered Star)
Spells
Enhanced Diplomacy, Face of the Devourer, Memory Lapse, Persuasive Goad, Savage Maw, Blistering Incvective, Dwarven Veil, Focused Scrutiny, Instrument of Agony, Channel Vigor, Fearsome Duplicate and Pain Strike