just off the top of my stoned as fuck head...
https://bankofgage.co.uk/
http://www.cannabis-seeds-bank.co.uk/index.php?
http://hempdepot.ca/
http://www.worldwide-marijuana-seeds.com/
http://www.cannacollective.co.uk/seedshop/
http://sowamazingseeds.com/shop/index.php
https://www.seedboutique.com/
http://www.castle-marijuana-seeds.com/
http://www.sensibleseeds.com/home.php
https://www.cannaseur.com/
and this one is always worth posting... http://en.seedfinder.eu/database/strains/alphabetical/
https://bankofgage.co.uk/
http://www.cannabis-seeds-bank.co.uk/index.php?
http://hempdepot.ca/
http://www.worldwide-marijuana-seeds.com/
http://www.cannacollective.co.uk/seedshop/
http://sowamazingseeds.com/shop/index.php
https://www.seedboutique.com/
http://www.castle-marijuana-seeds.com/
http://www.sensibleseeds.com/home.php
https://www.cannaseur.com/
and this one is always worth posting... http://en.seedfinder.eu/database/strains/alphabetical/