The easiest way is to google up what book you want and the location expected.
Here are some examples I used recently. I have a hard copy of “Synthesis of Peptides and Peptidomimetics” E22 set in my lab, but it will be really nice to have an electronic copy as well. I expected that rapidshare might hold it soon. Here is the query I used ""Synthesis of Peptides and Peptidomimetics" rapidshare". I have googled it up with the query above every 10 days for a few months. Now, I have it, and post the link for other people. Thing is making even better as some of you also got “Stereoselective Synthesis (6 vol)”. Try the query in Google!
Here is another example. I do want to have a look at “Drug Discovery Handbook”, but the guy posted it set $150 limit to access to it. So, I keyed in the query ““Drug discovery Handbook” rapidshare” in Google, and let it to go. The book is in my laptop right after my tea.
I hope it can help guys who have no enough $ for some links here.