Although I cannot assist with local availability, here are a couple of codec selection pages from major manufacturers that would serve as good starting points:

• Texas Instruments
• Analog Devices
• Maxim Integrated Products

As you can see, you will need to greatly narrow down your criteria before being able to select a device, such as your required sampling rate and resolution, linear or non-linear (e.g., A-law) scaling, etc. Although you will find no shortage of codecs that accept control (e.g., audio levels, interface configuration, etc.) communication over I²C, finding devices that actually transfer the audio data over the I²C bus will be significantly harder. Audio typically requires continuous, predictable and significant bandwidth, all of which are somewhat challenging to achieve on the relatively slow and unpredictable I²C bus; faster buses that offer guaranteed timeslices (e.g., I²S) tend to be more common.

--Sasha Jevtic