Most reliable, with out a doubt....

www.hempqc.com (heaven's stairway)

www.seedsdirect.to

these will definitely NOT rip you off, have excellent costumer service should a problem arise, are secure and ship discrete. Can't go wrong. By the way I've tried several Nirvana strains and they are often awful. Cheap in price, extremely cheap in genetics. my 2 cents anyways. You can find cheaper buys (heaven's stairway F2's for example) that are extremely nice and affordable!