Xiaowei Touchless Foam Soap Dispenser from Xiaomi Youpin US $13.20 (~AU $19.48) Shipped @ Banggood
Update: Found a new coupon BGXV12A US $0.13 more expensive.
Slightly cheaper than last time it was posted.
Note: Reading comments from the last deal, you can't use liquid soap only, you need to mix soap with water 1:2.
Or you can get Palmolive Foaming Soap which is what I've been using and it doesn't need to be diluted with water.
Price in title inclusive of GST