There's been some talk of how the sole distributor of Luxeon diodes (Future) selling the premium-binned Luxeons only to large accounts. The smaller guys like the Shoppe who resell Luxeons will no longer be able to get the premium-binned parts (T-binned III's and W & X-binned Luxeon V's) unless supply outpaces demand.
You can still find V-binned 5 watt Luxeons but W and X-binned have been impossible to find.