Looking at Freescale's website, the appropriate part number appears to be MC7447AHX1267LB.
Clicking on the "buy from distributor" links gives three choices. Arrow Electronics lists the prices as $273.83, but doesn't say what kind of quantities are involved to get said price. Future Electronics doesn't list a price on their site ("call for pricing"). Newark InOne lists their price for a single unit at $292.45, but the default number loaded into the add to cart field is 44 (the chip apparently ships on trays of 44 chips). Not sure if they will ship a single chip or whether you have to order in lots of 44.