good carpet cleaning products?

Im thinking of maybe just buying a black carpet from Wal Mart with no jute instead and just cutting and trimming it to fit, and buying a roll of insulation from home depot (my dad bought a roll for 25 at home depot and it makes a world of differnece inside the car- heatwise and noisewise)....i really dont want to drop $140 on a brand new carpet so i think i mite go this route....has anyone else done something like this before?

I went that route with a Brat I had, it worked ok at best, I'll tell you, the stuff they sell at walmart is at most 3 feet wide, so you'll need atleast three rolls and you'll have to deal with one or two exposed seams.

I honestly wasn't happy with the stuff, but my Brat was a beater with a few holes in the floor, I only did it to keep some of the water, dust and heat out. At any rate you're going to end up spending half of what it would cost to do it right and have it last the first time.