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By War_Z
#44215 The HDC1080 is $4.40 from DIgiKey, plus shipping. Oshpark board is $1.85 for 3 boards. Each board has 2 resistors, a capacitor, and 4 pins, which together add a few pennies. Depending on how many boards you make up it's about $7 each. The Sparkfun board design is nice, the pull-up resistors are each connected to power by soldering across two pads. The NodeMCU already has pull-ups so I disconnected the sensor board pull-ups when I had the sensor connected to my NodeMCU.