According to the Pathfinder Society Roleplaying Guild Guide (v8.0). A Pathfinder Society character may purchase any items in their chronicle sheets plus any items in the "Always Available Items" list on page 20. It also says on page 20 that characters may purchase items by capitalizing on their fame and there a "Maximum item cost per fame" table. However, I don't see anything in the prestige awards that you can use to buy expensive items except for the 750GP "free" ones.
Does your Fame score allow you to buy ANY ITEM that is within the limits of the table, even if it's not in a chronicle sheet or the Always Available list?