Both Máiréad's and Cora's fiddles are from a company called Skyinbow that provided many fiddles for all of Michael Flatley's productions. The lady's endorsement page can be found
here.
On Amazon you can buy the Michael Flatley Collection DVD, which includes Feet of Flames and Lord of the Dance, for only $15. It can be found
here.
Or if you would rather buy them separately at $12 apiece:
Lord of the DanceFeet of Flamesaislin