looking for a good and CHEAP SOUNDPROOF MATERIAL

This stuff

Try looking and asking at SPCR.
I have the Akasa Noise Buster and frankly it looks alittle better at noise reduction then that TT stuff, in really tho it does not do all that much noise reduction. But it was still a fun project to install and if nothing else the inside of my case looks better.
Your best bet is looking around the SPCR forums for ideas and maybe try ask about cheep DIY noise reduction material's there.

If your in the US Jab-Tech has good selection of noise reduction items, its where I bought most of my noise reduction items. Frozencpu is also a good place to look, just there prices are a little higher and they did not have the 80mm fan I needed.

And if you want a cheep noise reduction trick Yate-Loon 120mm fans are quite at 7v and silent at 5v they have a smooth low pitched noise and are around 4bucks, and yes they come in black also. The only advantage of the orange fans is do help give your computer a very unique look.