If I want the strains listed below, then I always buy my seeds on-line from Serious Seeds. I have ALWAYS had 100% germination, and a ratio of 75 : 25 female : male (but maybe that's just luck)
Serious Seeds Website
Review - Serious Seeds is a small firm, concentrating on the production of high quality cannabis seeds. Serious Seeds have five world famous strains, AK47, Kali Mist, Bubble Gum, White Russian and Chronic. Over the last 7 years they have won 18 awards at cannabis festivals.