So I was looking at my DS cases and thought to myself, i am really annoyed with how the cart is shaking around in it. I cut the corners of the DS slot too thin so the GBA/GB carts shake around in it. I took the case and cut out the DS slot all together. Then I hit up the new hobby shop in town (yes we never had one before) and picked up some 'funky foam'. I cut them 5x4.5 inches and measured out the game cart on the foam and cut a hole for them.
Here are a few pics of my end result of what they look like.

the foam on the side of the case is some extra that I used to fill it in. Hey I'm on a budget right now being poor and all.

Draw back is there is now a hole in the case that you can feel from the plastic outside. I might get some really thin foam and use it to fill that in. We will see, maybe a test for another day.