If it was obtainable, it controls four 5x7 displays. vs (MPC21018 + 5 NPN transistors + 5 base resistors + 5 current limit resistors) x 4, plus larger board to put it all on, plus debug time for wiring errors, plus increased coding time, vs $13 and some I2C commands, possibly using a library.
Here's what I would do: get a part like 74AC299 from Newark (I just bought 20 in DIPs for 56 cents each) to drive the anodes, and something with more current sink capability like a ULN2003 on arduino outputs to pull the cathodes low. Then put a bunch of them in parallel, make a 25x7 display.
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