On Friday, 28th September 2018, I saw Kinja Deals posted a post regarding Tile Mate discount on Amazon. It is almost 50% cheaper than their usual Amazon price of about US$100.
The Tile Mate 8-Pack retails for US$43.58 (S$60) and delivery to Singapore is an addition US$5.01 (S$7). That works out to be about S$8.40 per Tile Mate. In Singapore, Courts is selling a single Tile Mate for S$29 with no option to buy it in a pack.