Rough estimate $$$ to build a ported box for 2 12's?

Well depends on how big you want your box. I just built a ported box for 1 hdca 12" with 2.78 cubes of space. Not sure on port area, around .875 cubes. I got 3/4" mdf wood, 4'x8' sheets for $30 a sheet at lowes (You may need two). Then you need a screwdriver (preferably a drill). Screws are around $5. Then you need caulk about $4-$10. And a caulk gun, which start about $10-$30, but I found mine quite a ways over for $2 (made in china, but it gets the job done). Then if you paint it it'l be about $7 or so, I would liquid rubber (rhino liner it) or get actual wood paint $10 a can, and a brush and paint it. Not sure on carpet, but its cheap. Now when you put it together I think you need to drill tiny holes first, because I screwed the screws straight in and it split the wood bad.

So without paint/carpet, your looking at about $50, unless you dont have a drill or screw driver

 
I recently made myself a box for the first time ever, went to lowes as said above, got a 4'x8' pallet of 3/4 MDF, you won't need to buy 2, I have a whole quarter panel left over for scrap, I have plenty for my 1 12"

If you have the tools (router+jig, screws and or proper glue/clamps) it should only set you back about $32.00 + tax.

 
If you have the tools and your building it yourself, not much. I just built a 4^3ft box and it took almost all of one 4' x 8' board. So you'll probably need two. You don't need any caulk. Just don't be stingy with the wood glue. I rub a line of glue around the inside edges of my box afte I glue the pieces together. So around $70-$80 for two 3/4 mdf boards, glue, and screws. I would recommend some clamps too if you don't already have them.

 
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