I just made a rather boneheaded discovery, and wanted to share. The Vsonic IEMs are getting suggested a lot on here, and many are using LendMeUrEars.com to purchase them. They are a great seller, I've used them a few times, and would recommend them.
However, those in the US, make sure to change the currency at the top of their site to USD, not Singapore Dollars. If you do the transaction in Singapore Dollars, you will be charged an extra 2.5% by PayPal for the foreign conversion fees. If they invoice you in USD, and you pay in USD, PayPal does not collect the 2.5%. For me, this amounted to only a few dollars, but for big transactions, this could be a big deal!
This likely applies to any time there is a money conversion taking place, on any site.
Hope this helps someone!