Where do you buy CDs?
To be honest most of new cds (Jazz, Cetlic, Alt-Country/Folk) I buy are not carried by Tesco and certainly not Asda. The others are used.
Tesco & Asda usually offer the best deals for Music CDs.
You must have terribly mainstream tastes, how awful for you. Would you like to borrow my post OK Computer Radiohead collection? I have some stuff by Refused too, because I'm eclectic. I've got a couple of things other people listen to, but that's mostly irony on my part.
I like italics.
Charity shops and auction sites.
Tesco & Asda usually offer the best deals for Music CDs.
You must have terribly mainstream tastes, how awful for you. Would you like to borrow my post OK Computer Radiohead collection? I have some stuff by Refused too, because I'm eclectic. I've got a couple of things other people listen to, but that's mostly irony on my part.
I like italics.
Oh well, we're all entitled to our taste of music. 
I'm not a music person - don't have the patience to listen to boring stuff. I love watching movies much more than listening to music.
Still Play.com mostly for me.
Mine is nearly all classical so it's hard to look past Amazon. Music is so cheap nowadays that I don't see price as much of an issue, convenience is much more important. We still have a HMV in Birmingham but their classical range is hopeless.
Chris
PS I don't blame Amazon for not paying tax. Every company in the world arranges their affairs to be the most tax efficient. If governments don't like it then they need to sort out the legislation!
Did HMV pay any tax?
We still have 2 HMVs in Norwich and a classy classical shop called Prelude records or something like that if I cant get what I want in HMV I use amazon or play .com
"CDs"?
Try to use independent record shops as much as possible, usually have helpful knowledgable staff, they pay tax and most have excellent online services too. Strikes me as odd that so many people bang on about the value of a good hifi dealer, but are more than happy to use large corporations to penny pinch on actually buying music.
I also use Amazon, based on range and price, but I think that Presto is superb for Classical. The weekly mailing is great, the preview facility is brilliant and there is always a variety of special offers. I have to say too that it pleases me to support an independent concern!
Always online, mostly Amazon ( often marketplace) - I do compare, but for the stuff I listen to the supermarkets usually do not stock it or it is dearer. I gave up shopping on the High Street years ago, as they rarely had what I wanted and if they did it was far too expensive (without even allowing for the cost of parking, petrol etc). The last time I bought anything at all on the High Street was over seven years ago and that was a distress purchase.
The chance would be a fine thing.
Amazon and Ebay. Many of my cd's were bought from Amazon same vendor and never had a problem.
Mostly ebay these days as I tend to buy more used than new. Also there's a shop in my nearest large town which sell used CDs, DVDs and games for much cheapness. Big place too, and while you won't find many recent (2012/13) or obscure titles, nearly everything is 3 for £5 or £1.99 each, including the DVDs, which is fantastic. Same price buys me two lossy singles from iTunes or Amazon.
Main gear: Mac Mini > HRT Streamer II+ > Marantz PM66 KI > Mission 794
Also cluttering-up the place:
Thorens TD160 no cartridge; Marantz CD63 mkII KI; Technics SL-P777; Cyrus 2 + PSX; Cyrus Tuner; Nakamichi DR-1