You can check @Cashmere Cosmetics they do a lot of offers, or if you're looking for non-costly ones you can check them out @Miniso , or @Cozmo where different brands are available

Where can I find blackhead remover kit ( tweezers, loops )?

@Miniso

Where can I find a usb cup warmer?

@Miniso but it keeps it warm and not hot

Where can I find a face humidifier?

@Miniso or @Ubuy Jordan

Where can I find cheap flipflops?

You can check out @Miniso , but you can find better quality @LC Waikiki

Where can I find a Yoga mat?

@MUMUSO and @Miniso

Where can I get empty plastic bottles to fill it with Vitamin E oil?

You can find them @Miniso or @MUMUSO and they have them in very cheap prices

Where can I find cheap water bottle for daily use?

I once bought mine from @Miniso but I also heard that @MUMUSO has some as well with cheap prices.

Where can I find cute and cheap coffee mugs?

@IKEA they have awesome ones in different colors, but if you are looking for cheaper ones you can always buy some @Miniso