What do you have to offer...?

Things that can buy you fairies are mainly "Rare" items (with Disease, Panic, or Blast on them - (not for Tail Whip/Foul Axe, Spirit Katana, or M.Rifle, respectively), Silvers, Cookies, Drakes, and perhaps some collectibles (I like Time Crystals, but you prob. don't have any yet...).