Talk to the priest that saves the game and ask to give a donation. If you have less than 100 coins he will give you 10 coins until you reach 100 coins. After this happens, deposit the coins, return and repeat as needed. Note: If you try to have the priest give you more than 100 coins he will take them as a donation.
Starbringer Sword
The StarBringer Sword can be found by standing on a blue "chance" square in the Thieves' Tomb and fighting repeatedly.