While out shopping Tai finds a nice Amulet of Mighty fists +1 and forks over the gold for it.
Paying 1,000gp for an Amulet of Mighty Fists +1.
Which will give him a +1 to hit and damage for his Martial Arts Attack, his Flurry of Blows, and his Stunning Fist attacks.
But not his shuriken.