Where do you buy good CD recordings?


What are the recommended web sites for buying CD’s? I noticed that some sites (like www.hdtracks.com) provide music to download (AIFF Format). What is your experience in downloading music? I like the www.referencerecordings.com web site and am looking for other similar sources. Are there any stores that you recommend for buying music? I am interesting in looking at a list of CD’s to include a brief description and some sample songs to listen to before I make a purchase.
hgeifman
In addition to Amazon, Berkshire, and Tower:

mdt.co.uk
jpc.de
hmv.co.jp
allegro-music.com
50%half.com
the rest is from local NYC stores such as 'Other Music'

Good CD recording is defined IMO by the artist and album you like to listen to.
I use itumes (preview) to hear whether I like the music, and use the options of "Buyers used similar music" to find similar music. Then buy new CD's at amazon.co.uk which is very cheap at the moment.
I also use Ebay, but the wholesellers tend to use bubble envelopes which is insufficient protection for International shipment, shipping carton protect much better.
Favorite record companies are Telarc, Chesky, Verve but Chesky seems to boost the recordings
The above was great information. I looked at Amazon.com and it looks good. Thanks to everyone for responding. Audiogon is an outstanding resource for getting useful info.