Hello John! I'm relatively new to the forums, but I know a few helpful things about vaping. I would steer clear of convenience stores or gas stations..it's low quality and harsh. Find a good mix of 80/20--80 VG, 20 PG. I'm personally a fan of eJuices.com or eLiquid.com, but the main takeaway here would be to shop online, in general, for quality juices.