I purchase my Korean rhinestones from ShineArt or Nova Rhinestone Depot. They are both located in California and both get their rhinestones from the same overseas supplier. ShineArt has more wholesale prices and sells in bulk quantities 1000 to 200 gross depending on the size of the rhinestone. Nova also sells in the same large quantities but you can also purchase by the gross if you want to try out their rhinestones before you make a larger purchase. Neither one I believe gives out free samples but you can purchase a sample card which has the different color rhinestones attached. ShineArt and Nova are the two companies I have found so far that have the best shape and quality rhinestone. They both have very good customer service too.