You can get some really nice books at "used" prices, that look as good as new. Some are actually new. I buy books on architects, construction and some on codes.
The two sites I use to purchase books are Amazon and Alibris. I figured everyone knows about Amazon, but not Alibris. I don't remember where I found the site, but when I find a book I am interested in, I check both sites. I never know which one will be less expensive.
Amazon Prime member like me, sometimes you can even get two day shipping for free (sorta, you do have to pay for the prime membership!)
So when you find a book you like (I'll use Amazon as an example this time). You will see in the listing the new and used prices.
I hope the helps some of you find some really nice deals, I think I have and I will keep looking.
Below are some pictures of some of the books I have purchased. You will notice the two Chicago books which I recieved today. I was inspired by some of my internet architects friends who said what a wonderful time they had at the AIA Convention. Happy shopping!