A year sgo I was suffering with Plantar fasciitis and Metatarsal stress fracture.  It took months to heal. My podiatrist made me orthotics that helped some and before that he casted my foot and then the boot.  Until I took the chance and ordered Birkenstocks, I suffered.  NOW! I wear ONLY Birkenstocks and am pain free.
You do have to wear the birkenstock gradually and work up to wearing them all day.  Once you have done this, you will have relief like you didn't think was possible.
Amazon has the best prices.  I have looked, this is fact.
Love my Birkenstocks and I hope others buy them.  They won't regret it.