You don't need to use that, there are several styles of grass from them made by several different brands.

Noch

Silflor

Woodland Scenics

Heki

That tool you saw is for the static grass, but they have pre-made mats, small pre-made, self stick tufts, dyed animal hair etc.

Each type/brand has it's own price range. Woodland Scenic dyed animal hair would be amongst the cheapest but require the most labor etc.

For instance, here's a one piece mat, 23"X47" for like $14.00:

http://www.sceneryexpress.com/prodinfo.asp?number=NH00250