http://list.qoo10.sg/item/BEST-VALU...-USB-USB-ADAPTER-I-AUTHENTIC-XIAOMI/474694571
3 bucks
No idea if they're actually authentic, but I'm sure a bit of looking at reviews will sort that out
I was passing by Sim Lim Square today and i picked up some Remax USB-C cables, 3 for $20, available at quite a number of handphone accessory stores there (they're probably all owned by the same guy). I've noticed that Remax cables are also being sold at Toy Outpost stores across the island.
I recall people mentioning in this thread that Remax cables may not be 100% safe but I've got 6,7 of their Lightning and USB cables lying around the house and office, and they've always been rock solid. Not too many cheap alternatives right now, unfortunately