Check your items from database, at armor/weapon/etcitem, there should a column named "price".
Or you can ignore this column from java, by setting it to 0 adena for each item.
There is nothing you can change, this is the cycle where the olympiad is saved.
First of all, you should set up your olympiad settings from General.properties
And then you can use "manualhero" in-game in order to restart it (will start operating next day).