Does anyone have any recommendations for sources of "white noise" cds? My 6 week baby boy has colic and our only source of sanity these days is the vaccuum cleaner; when I turn on the vacuum, it's like magic - he passes out. I've seen a few cds on the Internet that have white noise like vacuums, blow dryers, etc. I'm wondering if anyone could recommend a good cd and a reliable source to purchase it from. THANKS!!!