If you're in the states, then often recommended is Essential Depot, or Bulk Apothecary for bulk pg/vg. In EU, the cheapest good quality is probably pink-mule.com, molinshop.com and e-aromashop.com (inawera distributor)
Aromas recommended are too vague, but companies generally most used are TFA/TPA, Capella, Flavour Art, Inawera and Hangsen. There's also Flavor West and lor'anns btw... Also, molinberry is a newcomer that's very good...
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