More than three weeks ago I purchased a what seemed to be a reasonably priced pair of earphones (Sony MDREX310SL) on Lazada. They priced it at around RM230, which I could accept. Further, it would come included with a carrying pouch, a few different sized earbuds, as well as noise-isolation earbuds. I've never had earphones with changeable earbuds or noise-isolation ones, so I was quite happy.

Three weeks went past, not a single update from Lazada. I contacted them, only to be notified via email that they have cancelled the order due to dubious processing time promised by the seller.

Now I'm left with my clunky Sony XB-400 Super Bass headphones. It definitely serves its purpose, but I feel that carrying it around is a hassle, I prefer earphones which are much more portable. I also want to make my purchase online, but I can't seem to find a reliable shop which sells Sony products.

I need your help, and welcome your suggestions, if you think there are better earphones in the price range which are not necessarily branded Sony.

Thanks.

Your statement is misleading, it's not all the IEM.
Here's a list of Sony IEM i find its good for its price.
- MDR-EX600
- MDR-EX800ST aka MDR7550 
- MDR-EX1000
- MH1C 

Not sure about the XBA-H series and the newer A series.

I checked out Jaben Audio, but they stock expensive ones, which are clearly out of my meager   budget. But I think I can push beyond RM250, less than RM300, to be precise.

Now that you've mentioned Audio Technica IM50, I'm torn between the two ( but still considering XBA-1, unsure of the price ), but the problem is, while I've found sellers for AT IM50, I haven't found any for a discontinued Sony product. Any thoughts?

Thanks for your recommendation by the way, I learned a lot. Bear in mind I know next to nothing about earphones, in fact, I only learned what IEM was a day ago when you guys mentioned it... 
Why do you say so? I learn towards Sony simply because I've bought Sony products and they've lasted for a long time. I haven't heard of XiaoMi, it seems like it's pretty easy to buy a fake XiaoMi Piston if you're not careful. Thoughts?
They are out of my budget...