Samsung’s wireless charging kit for the S4 is one option that is now available in the US. It uses the Qi wireless charging standard, so if you already have a Qi charger, all you’ll need to do is grab the backplate for $39.99. Otherwise, you can also snag the charging pad for $49.99.
$90 for wireless charging is expensive, especially as some phones have it built in as standard and a spare plug to charge the phone is only a few dollars.
Update – its now in the UK via MobileFun for £40.