I usually buy my Blu-ray new, when their price drops below £10 on amazon.co.uk (usually around £7.98 or so + shipping) or below €10 on amazon.de (usually around €8.99 including shipping).Shipping on amazon.de is free for Blu-rays.
I too like to buy my blu-rays new. And i too use amazon for the most part. (but i use amazon.co.uk) And the prices are much lower then the prices here locally sometimes. Usually from £10-12 plus the shipping for a £1 and such. I'm very happy with amazon btw =)
Shipping is free for all blu-ray? Wow that would be cool.
And I always make an effort to promote www.find-dvd.co.uk. You can set monitors on titles so they email you when they reach your budget and they are normally very quick, so if say Amazon discounts one you've been waiting for by 60% for one day only, Find DVD will tell you. Sam has mentioned another similar site before. Camel something?