In lieu of Cree Royal Blues, there is a lot of chatter the Satistronics 3W LED Blue is very similiar in output and color to the Royal Blues. I bought 5 from them (minimum order) and it took 2 weeks to arrive. Total including shipping was just under $13.00 USD.
http://www.satistronics.com/3w-high-...5lm_p1316.html
They are very bright, but I don't have any Royal Blues to compare them to, but I am happy as they will be supplementing some White Crees.