Amazon was having a 48% off their Samsung 850 EVO 250GB last month (I bought it on the 11th November 2015). The listed price is US$149.99 (S$213) and the discounted price is US$74.99 (S$106).
Another good news is that it qualifies for the free AmazonGlobal Saver Shipping to Singapore if your total qualifying purchases are more than US$125.
