Where to get 18 watt PLL tubes @6500 K color temp?

[mjck]

Hi All
Bought a 1.5 ft Atman lamp @ NA but they ran out of stock for the 6500K PLL tubes. Went around Balestier but cannot find any. Were told that osram dont make the 6500k for 18watts.

Anywhere to find them ?? Thanks

[kingpin]

Osram have 18w 6500k PL tubes. Bought 2 from NA last week. But price more expensive than other brands.