yourmusic.com
I've been using yourmusic.com for several months. It is a re-working of the BMG club. You create a list of the music you want (like with Netflix). Then monthly they ship you the next one in your list. The CD's are all $5.99 and free shipping. They do, however, charge sales tax. For box sets, the $5.99 price extends (example 5 CD set would be $29.95), however, box sets cannot be on your list, you can just buy them any time. You need to sign up for the monthly CD service in order to access the prices. You, can, however, cancel at anytime. So if you have a bunch of stuff that you want, you can sign up for the subscription, make all of your purchases you want, and then cancel.
My gripes are twofold:
1. Their search engine is awful!
2. The selection is limited. Big name stuff I could find. More specific targets, especially classical music titles, evaded me.
I like the low prices for what they offer. Hard to beat $6 new CD! For me, also, I like having a list of titles and getting a new CD monthly -- evens out my music purchasing. Keeps me in check!
I do not have a SACD or DVD-A player, so I have not investigated SACD or DVD-A from them.