TWK - constantly very good, good customer support and relations, but very expensive (150-200e per kg, no special discounts). I also had one strain lab tested and it showed very high quality. ThomThom - usually good, but not always (last year I wasn't that satisfied), very good customer support and relations, good price (80-127e per kg depending on your account status) EUKratom - *I know them only for the last half year* - very good quality of a few different strains (green maeng da, super gre