If you are looking for options specifically.
These suppliers are well-regarded in the DIY fragrance community for providing high-quality bases:
Your (to check for shipping or local alternatives like Everclear). Perfumer's Alcohol - Vetiver Aromatics
: Do not use isopropyl (rubbing) alcohol; it has a strong chemical scent that will overpower your fragrance and can be harsh on the skin.
: Offers "Base de Parfum," which is a pre-diluted blend of professional-grade 200 proof SDA 40-B ethanol with other functional ingredients. Buying from Major Marketplaces