I noticed these showing up on ebay. Looks like 4 pieces of 8x8 on a common PCB. There are a number of ads for them, perhaps all the same, perhaps not. I chose this one because they show pictures of a longer string.
I doubt that they purchased 4 MAX7219 for $5.59 and that aint counting the LEDs, etc.
Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.