Should I buy low nic juice or high nic juice and dilute it down to lower nicotine?
MyFreedomSmokes is having a sale right now on 100mg/ml nicotine - 1 liter for $50.
I buy 100mg/ml from MFS and split it into 120ml bottles and freeze them. 120ml of 500mg makes 500ml of 24mg/ml nicotine which lasts me a while for mixing.
Okay, as others are saying you want high nic and dilute it down.
Others are also telling you to get smaller glass bottles to store it in, but aren't explaining why. The reason is that nic oxidizes in contact with air. You don't want that. To prevent it, put your nic in smaller bottles and fill them as completely as possible for storage in the freezer so only one small bottle is getting air in it as you work.
Finally, the one thing I wouldn't skimp on pricewise is suppliers. I am a huge fan of Nude Nicotine. Have used some other suppliers and NN is by far the best I have tried. They do their own chemical analysis not only on the nicotine batch, but on the VG and PG dilutants they use as well and send you the results along with your batch. They cost a couple of bucks more, but it is by far the cleanest nic I have tried. Since I started using Nude Nicotine I have become a pretty huge fan boy, and have no financial relationship with the company except happily letting them take my money.