I LOVE Mephisto. You really need to just buy from their own store if you can wait for it
www.mephistogenetics.com
They also have a UK/CN/Global(EU) site.
They give out freebies with every order. So first off the packs, if you buy a 1 seed pack, you get 3 seeds, if you buy a 3 seed pack you get 5 seeds, and if you buy a 7 seed pack you get 9 seeds.
On top of that you get extra freebies:
$15-49: 2 free seeds
$50-99: 5 free seeds
$100-149: 7 free seeds
$150+: 15 free seeds
If you absolutely cannot wait for their store to open you can pick up their gear at quite a few places but the recommended one’s are:
D.C. Seed Exchange
The Seed Vault
The Seed Cellar
Harvest Mutual Seed Bank
If you purchase from one of these places you do NOT get the EXTRA freebies.
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Another one to look out for, NightOwl Seeds. This is a one-man show ran by one of Mephisto’s Head Growers, Daz. The direct way to buy from them is from www.theseedbazaar.com
He makes his own unique crosses using some of Mephisto’s gear + his own. Same quality as mephisto, prices are a bit higher and you don’t get the EXTRA freebies but do get the pack ones. So for example, a 3 seed pack from nightowl comes with 5 seeds in it. NightOwl is having a drop on July 3rd if you can keep your eyes peeled for it.
Edit: On a side note, Stan(runs the US Mephisto) posts regularly on www.reddit.com/r/MephHeads so thats an easy place to go to know when the store’s will be open and what stock they might have.