Given the MPU6050 itself is $10.72 under 5000 pieces ($4.59 Q5000) this seems to good to be true.
So you could be looking at:
(a) A counterfeit part
(b) A part that was discarded as it does not meet spec
(c) A part that walked out the back door.
SparkFun is expensive but they have to stock a lot of items that may not sell regularly.