I dont know about Nirvana, but BC Bud Depot or bcbuddepot.com, is very reliable. Ive always had good gemination sucess, there seeds come in a plain envelope with a cover company, so theres no reference of it on the outside, stealth like. they also re send you more if for some reason they didnt sprout. There also probably forums inside every companies seed page online, so you could get those reviews on Nirvans products