I have found that www.pexuniverse.com and www.supplyhouse.com are very close in price. The one difference though is the

$306 3/4" Blue ViegaPEX (500 ft. coil)
http://www.supplyhouse.com/Viega-32245-3-4-Blue-ViegaPEX-500-ft-coil-12423000-p

vs
$178 3/4" x 500ft PEX Plumbing Tubing, Non-Barrier (blue)
http://www.pexuniverse.com/store/product/3-4-pex-plumbing-tubing-npb3450

perhaps I am missing something. I realize the description of the two are different. But there is also about double the cost....for what?