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They are particular good for volume pricing. They do have minimum orders on some parts, not the MCUs, but the minimum counts are usually low, typically 3 or 5 pieces.
Occasionally, I'll order a few Microchip MCUs from Mouser or Digi-Key just for a matter of convenience, i.e. when I have placed an order for other non-Microchip parts and I need a PIC to finish the prototype.
They are usually $1 or $2 higher than Microchip Direct.