Level 1 Rituals: Silence: 75gp, Secret Page 50gp, Magic Mouth 50gp, Gentle Repose 50gp, Comp Languages 50gp, Animal Messenger 50gp.
So 50gp for 1st level Vestiges Market Price. Forgot about the component, but quick glance looks about 10gp. However, if we go like the Rituals and you need 50gp for a book, then you can buy the book and a single Ritual, but you can't actually use the stupid thing yet.
Perhaps Binding itself should be a feat which allows you to Bind Vestiges to yourself. This feat could also give you two 1st level Vestiges when the Feat is taken. Should this also give 20% of Component Cost or start that up separately? Classes which are normally granted Rituals for free [Wizard and Cleric] could instead choose Binding rather than Ritual Casting.