Omnimount seems to sell the cheapest mounts around.
Mounts and More (spell it out, add a .com) seems to be a source for those. But one you find the parts you want from Omnimount's web site, you can go to shopping.yahoo.com, pricegrabber, or your favorite comparison site for more.
Just got a flat wall mount for my 42 plasma from Mounts and More. I saved at least $55-$105 compare from other site i visited. The live person is very nice and helfull. They have good follow up on your order. Shipping is free.
I'm not affiliated by any means with this company, just a happy customer of them. Check them out and good luck.
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