For years our group has made one roll for each hero looking for rare items and interpreted the result to mean that all items of that rarity or less are available for purchase to that hero. If, for example, I roll an 8, that hero can buy any one item of rarity 8 or less.
Now as I reread the rules I am not so sure. It could be read that a hero must first choose what item he wants to find and then rolls to see if he finds it or not. How do all of you play the availability of rare items?