If there is a specific reason to use the address for the PCF8574A? you can always re-assign the address with . . .
He has stated his reason but there are others as well. What if he has more than eight displays in his system and he needs another bank of addresses.
Back to the original question "does anyone know where i can get one similar to this . . . but with PCF8574A (Note the "A" as i need the I2C address of the "A" version)."
It's seems to be pretty much of a crapshoot as to which chip they stuff in the board at assembly time. You will probably have to query each vendor to see what they have in stock at a particular time.