What is your go-to online place to buy physical medium of music? And why?

For vinyl no online purchases under any circumstances unless purchasing SEALED or purchasing directly from band. Condition of vinyl that joins my personal collection must be like new and not any less.
CDs I used to get from Columbia House or BMG depending on who's got best deal. It was long time ago. Now these clubs don't function. I was always making my membership new -- this way you get the best deal.
Once membership is not new, I'd cancel it and wait for another new membership invite keeping price per CD $2...3. When CD started being out of print, the time to sell would come and make some money :-)
For rare copies I'd shop in discogs(look for reputable dealer with nice feedback). Prior to discogs there was gemm.com and cdnow.com

I use Elusive Disc almost exclusively, with Music Direct and Soundstage getting maybe 10% of my orders, this is for vinyl and I use Amazon for CDs. Haven't been in a record store in 20 years. I also haven't been in an audio salon in 25 years and just completed my to die for reference retirement system.

Amazon  has been an excellent source for me regarding new and used CDs. Broad selection, good pricing and reliable shipping. I have no complaints with them.
Charles,

Elusive Disc.com is very good at shipping product out right away, and they usually have whatever you want in stock, or it shows up a few days later. They take great care in shipping vinyl and the packaging is stellar.


Matt

Amazon is my choice with new vinyl. They have the best return policy of any on line vendor. I buy from Acoustic Sounds or Oldies.com if I can't find it on Amazon.