You can buy 99% iso at a lot of grow stores in California. Gallons and gallons, no questions asked.
Here in California they sell 91% isopropyl alcohol at the drug stores. In other states they sell 99% isopropyl instead.
Amazon will send the 99% drug store bottles of isopropyl alcohol to California, you just can't buy it off the shelf here.
Here's the add at Amazon for the two attached pictures of 99%,
https://www.amazon.com/Mountain-Fal...1533599485&sr=8-10&keywords=isopropyl+alcohol
Note on the backside label it states: "CONTAINS ISOPROPYL ALCOHOL" - no other ingredients.
The backside label on a bottle of 91% will say on the back: 'contains isopropyl alcohol and water' - again no other ingredients.
I highly suggest not waisting your time and good herb trying to use 70% isopropyl alcohol, it has way too much water - you'll extract too much green stuff, and getting that much water out is too much trouble.