As someone who enjoys buying toys for my babes and has spent close to $500 over the years on them I can tell you a few things.
If your woman cums easily and often don't buy a vibrator. The stimulation is TOO MUCH for them. Get them a glass cock. If she takes a while to reach O get her a Hitachi magic wand, Jelly Osaki and/or Pharaoh’s Secret like shown here.