Where can I find Chinese IPA transcriptions?
As you probably know, in China they use pinyin to describe the pronunciation. Dictionaries will normally always mention the pinyin for the characters.

Here you can find the link between pinyin and IPA:


http://www.sino-platonic.org/complete/spp052_chinese_ipa.pdf
http://talkbank.org/pinyin/Trad_chart_IPA.php
http://en.wikipedia.org/wiki/Help:IPA_for_Mandarin


This is a website that will generate both Pinyin and IPA for a certain text:
https://code.google.com/p/transcripa/wiki/Mandarin

In Chinese tones change depending on the context, but the pronunciation itself much less so. Especially if you take what is considered as Standard Chinese (what they speak on CCTV), this is not expected to happen.

In my humble option, it is best that you learn Pinyin as it will help you in the long run.

Although it is not what you are asking for this website might also be very interesting for you: http://lost-theory.org/chinese/phonetics/

For every possible pinyin you can hear the pronunciation.