I have two 4 x 5.65" hot mirror IRND filters up on ebay now.
Formatt .3 hot mirror IRND:
http://www.ebay.com/itm/262266493111
Tiffen .9 hot mirror IRND:
http://www.ebay.com/itm/262266483502
Let me know if you have any questions or want some demo R3Ds using a Colorchecker Passport.