That is a pretty standard NXP chip that cost nowhere near the 20 bucks they are looking for it.
Silasmoeckel, I think it’s important to be aware that our I2C Differential Extender Breakout Board (see: http://sjtbits.com/i2c-to-differential-breakout-board/
) has more than just the NXP PCA9600 chip. This board not only increases the I2C bus capacitance, but also minimizes interference from outside sources through differential signaling.
That being said, we have now manufactured this board in large enough quantities that we can lower the price to $10. We look forward to continuing to serve the community.