Luciferase Supplier?

[Sonya Clark]

Does anyone know of a supplier for the enzyme luciferase?  We are 
particularly interested in a modified version which has low ATP 
utillization.  LKB supply this in large quantities and at great expense, 
and we only need a little.  I have also tried Tropix and JBL Scientific, but 
they do not supply the modified luciferase. Any other suggestions are 
welcomed.   Thanks.
Sonya Clark.
szsclark at ucdavis.edu