Stereo & Electronics - get me a 04 escalade ext now i need a box

hey guy i need a box its the same as a avalanche so some one help me lol. :bang:
wanted a jl audio box but there almost 1400 so thats out.
i posted on our sister site performance trucks but got no reply.
so what are my options? thanks guys

Have you tried Subthump? BTW, my sister just got a 07 EXT and very nice:)