As someone who regularly has to clean CPU dies and various computer chips for heatsink installation, I needed a ready source of 95-99% Isopropyl or Ethanol.
I was able to order a bottle of Anhydrous 99% Isopropyl Alcohol from my CVS. I just had to go up to the pharmacy counter and ask if they would place a special order for some.
I couldn't tell you where to get some actually labelled as pure Ethanol. I have a bottle only because my best friend's dad works at a machining place and got me a bottle.
99% Isopropyl will probably be much easier to get than 100%. The Anhydrous kind would probably be what you want.