Grady, I generally like to buy DVD-Audio discs online from Circuit City. They have all Warner titles for 13.99. For awhile they were running free shipping or free shipping on two titles. Amazon is also not half bad if you buy a couple discs to get over their $25 for free shipping then throw in one of the coupons they usually have floating around. DVD Planet also has decent prices.
For hard to get discs that you will never find in the store check out www.elusivedisc.com and www.acousticsounds.com .
J