You must be confused.
The "entertainment" department is not on the commission model and is responsible for Gaming, Software and DVD/CD's etc...
Maybe you mean home Theater?
Also it isn't 1 month of great sales. you have to be in the top 10% of the company for that department for i believe 1 quarter, or the whole year, i cant recall.. in order to get the items for cost.
Also, the discount is now Cost + 5%
On things like TV you usually save 200 - 600$ depending on the tv .. (more expensive 50+ tvs have the larger markups over the 40-46" tvs)
Computers you save maybe 50$
video games you save 0$ unless its used and cost is low. or if its clearance you can get games for 2-5$ sometimes.