[Kurn, son of Mogh]

When rebuys are allowed is specific to the tournament venue. At 'Stars and Foxwoods, you can rebuy when your stack is equal to or below starting stack size, meaning that everyone can rebuy prior to the first hand. When Mohegan had poker, their rebuy rule was you could rebuy once your stack was below starting stack size, so you couldn't rebuy prior to the first hand.