Care to buy garbage? That'll be a dollar per metric cube, thank you very much.
A big tile of a garbage dump. Lots of details. Economical on polygons. Instanced geometry, power of 2 textures.
An example scene with light setting and a displacement map shows how the tiles can be landscaped into hills and valleys of garbage.
A Unity 3D v3 package included, with it's own Max file adapted for Unity 3D export. Download 3D demo to enjoy a nice promenade in the garbage heap.