T-Echo, How to access i2c bus?!

There is this very small 10 pin socket on the T-Echo PCB that is where you hookup sensors that use the i2C bus, SPI, etc.

Where in the world can I find the plug for this tiny thing? I really need to add more sensors to my T-Echo device.

Badge Edition. Expansion module



Where can I buy these? Are there any vendors in the US that I can get it quickly shipped to me?