Im just getting into DIY myself so take my opinion with a grain of
salt. From my reading one stop has good stuff but you will be paying a premium for a pre-packed kit. I bought nic base that was on sale and picked up some TPA/TFA flavors as a separate purchase. I bought my USP grade VG from walmart (humco brand 177ml) for around 4 bucks. So far my only bit of advice is
buy more supplies than what you think you need. I wish I had bought a handfull of syringes to make it much easier to mix multiple flavors at a time. I'm sure others will chime in as well =)