I'm not great at forum browsing sure, but I tried and found no answer here, the best I found was at level 11 shops should sell Difluid, my MAG raising character is level 20 and shops still sell the same thing they did at level 1, is there a boss I need to defeat or some other trigger that will cause the shops to stock Di items?
<Edit>
Delete this, I got him to 21 and now they are selling it!