I do the car stereo wholesale in canada, but the problem is that you are in the US, there for double shipping would be reflected in the cost. Stick with a reputable online store, one preferably recognized by the BBB.
I heard a few good things about mmxpress, but be carefull when ordering stuff from places like this.
I dont know if they have what you want but I would recomend crutchfeild.com to anyone. They are real helpfull and have good prices and special deals. I got two polk ex12s and a box for under 200 including shipping.
Sounddomain.com thezeb.com WoofersETC.com Matrixcaraudio.com Carmedia1.com these are my personal favorites quick shipping if they are in stock and great service, except at Carmedia1.com I called and talked to some dan russian lady who could barely speak english and I don't think knew a thing about car audio, but if you conduct everything online your good to go.