I use both fragrances and EOs - some EOs are pricey but some are comparable to or cheaper than fragrance oils. I buy in 16 oz or 32 containers of: lemongrass, litsea cubeba (May Chang), lavender 40/42, peppermint, Himalayan cedar, ho wood, eucalyptus, and others. I compare prices constantly, and have found good prices at New Directions Aromatics, JEdwards, and SVA. Also have bought from Nurture, Camden Grey, WSP. I used to buy from From Nature With Love but their prices aren’t as competitive for the things I buy.
My advice is to stay away from vendors on Amazon unless they are reputable sources that have their own websites, or EBay, but that’s because of a terrible experience I had buying essential oils on EBay.