Go to the EDOT forums (google it). Go to their vendor section, there you will find vendors with lots of good reviews, these are the guys you want to buy kratom from.
So, a few days ago I tried 5 grams of premium leaf, an hour before work. The effects were still pretty intense, and I got more of a opiate high than I wanted. the Kratom slowed me down more than anything, and I couldnt even appreciate the high. I dont know if its still too high of a dose, or if premium leaf is just more sedating, but I dont want to try it again, in case I do just become tire and lethargic. I still reccomend leaf over extracts, but I think 15 and 20x extracts are more stimulating. Im going to keep the rest of my kratom for weekends.