dont really know of any sites but i kow it isn't cheap but if ur willing to try it your self it will save alot, say around $300-$600,
im in the process of making a single 12'' box molded into passenger side 1/4. it hasnt been to hard, just makes ur car smell for about a week.
if u would like to try it look in some of the audio mags because they will give tech articles on how to do it every now and again
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