what kind of cannabinoid are you looking for?
there are a huge chain of "spice" variation,one more potent than the other.(I have 5CL and I could supply ur demand here in europe with escrow)
Sice 5CL is one of the strongest and not everyone likes it i suggest you read a little bit about the intensity of the effect before trying.
Hope i did not missunderstood what "spice powder" meant.People use this kind of term loosely for verry different substances.
Best regards