I've had problems trying to order research chems from most of the usual suspects. The problem is that because I'm overseas, I use a US warehouseman/forwarder for my orders, but it has a different address than my cc billing address. That usually makes it impossible for me to book orders on many websites. So I've looked around, found a company for which this wasn't a problem and tried them out. Got a couple of items, including letrozole, all of which have tested out as good gear. Service was great - fast and, when a couple of items were inadvertently omitted from my shipment, they made good immediately, even doubling my order for free for the inconvenience. The outfit is MP Research Supply (ManPower Research Supply).