I made my own mixer with a computer fan, hardrive magnet and a project box and it works great. The mixer stirs 100mls nicely with a 20mm stirbar, thats the amount I make of my tobacco flavors. I make 200 at a time of my wife's cotton candy mix and it stirs it fine with a 25mm stirbar in a beaker.
I put the VG, PG and flavoring but not the nic, set a timer and mix it for a couple hours as high as it will mix, you could warm up the mix a bit with hot water and it'll mix a bit faster. I then let it sit overnight to dissipate all the air bubbles, taste then after that you can let it steep then add the nic or add the nic and remix for a half hour at a slower speed not to add unnecessary air to the mix.
I did remove all the fan blades off the fan and it spins faster than with the blades since there is no air resistance. Since this video I have added a volt meter to the box to show speed in volts and waiting for some small LED lights to light up the mix from the bottom so I don't need the flashlight to watch it mixing.
This is 100mls of nicless 6% Hangsen Highway I shook up some to show the bubbles moving so how it mixes can be seen. I will let it steep a few weeks before adding the required nic