Here is a link to a reliable online retailer with LOTS of 3 watt LED lights:
http://www.qualitychinagoods.com/lux...-76_87_89.html
And they even have the same bike mount for your handlebars:
http://www.qualitychinagoods.com/lux...cle-p-346.html
some of these are real Luxeon and some of them are not, you can usually tell by the price. Shipping is free and you get a discount for your first order.
This light has got good reviews on CPF and is very small but it uses CR123A batteries instead of more readily available AAs.
http://www.qualitychinagoods.com/ult...ted-p-482.html