I made my own transport case, very similar to the GW, buy a box with 2 floors in it and get your hands on some foam ( the stuff that is in the GW boxes )
The foam costs nothing and the box was 25 euro for me.
2 Advantages over the GW box :
It's not nearly as expensive
You can cut out the spaces in the foam yourself, optimising the amount of troops you carry with you.
In my box every model has it's stationary position, I can easily carry 3000 points in one box, haven't tried more.
In the lower part I have Cavalry/Monsters/heroes/anything that is tall, they stand up.
In the above part I can put 2 Layers : full foam / cut foam / full foam / cut foam, the models lay down in the upper part of the box.
40 models per layer is easy