Alright so I need some help on what to do I work at a toy store,

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Alright so I need some help on what to do

I work at a toy store, and we do card supply stuff for magic, yugioh and vanguard.

The magic guys and event organiser are pretty cool to the store employees except for one really rude guy. But for some reason the weeb card games attract a lot of guys who are super sketchy.
One group that we were helping complained about the discounts we were giving,then had the balls to demand a portion of card sales.
They got canned
Second/current group got outted for both not marking down any preorder sales for half a year, was stealing products and apparently, were buying from the T.O at cheaper and complaining to us about being more expensive than him. And I've noticed that only one of the TO for the non magic gets a special price and discount when all the others only get a set price

Now the problem is the guy is abusing his discount and is starting to get shady with what they order through us. One of the players asked him, not us the actual employees, if the manager got the boxes for him, but tried to say it super quiet so that we don't hear him

What's the best way to approach my boss about who gets what and why for the card stuff? Imo it seems kinda unfair that everyone gets a set price while this guy gets a cheaper price and a discount while complaining about it