I someday browsed on Sm website and saw ES18, which seems old PL18 with new colours. Then i saw specs- it has 10mm driver instead of 9mm used on PL18. Other specs was identical as E10. So i searched where i can buy it. It was available only on taobao, so i used agent- taobao-buying-agent.com. In china it costs 80 Yuan- half of PL30 price. I throw in 3 sets of foam tips, each costs 10 Yuan). Then i needed pay all taxes and at the end it costed me about $25. If ES18 sound like E10 or E30 it would be steal.
This is pic from agent before shipment. I choosed airmail because of price and it isn't noticably faster than China post.