If you use a lot, those brands will be very expensive. I make my own with light olive oil and a stick blender. It takes a couple minutes to gather the ingredients, and blends in about 15 seconds.
I never measure anymore. But here is a basic idea of how I like it.
In a square bottom container I combine:
*1 to 1.5 cups light olive oil (avocado would be good too)
*About a tablespoon of mustard (I use spicy brown. Most recipes use dijon)
*About a tablespoon of lemon juice( I use bottled. Most recipes I see us the juice from half a lemon)
*Salt and pepper to taste
*1 packet of erythritol/stevia sweetener. (Optional, but most mayo has a small amount of sugar, and I think it is better with it)
*1 whole egg
Put the blender head over the yoke, and go to town. After a few seconds, you see the emulsion starting. Slowly start raising the blender, and work it around until fully emulsified. No need to over blend. When you no longer see any oil, you’re done.