The SparkFun sensor is the Lepton 1 with 1/4 the resolution of the Lepton 3 (80x60 instead of 160x120). He really did get a great deal on the sensor!

A quick google search shots GroupGets [0] has a Lepton 3 sensor, no breakout board for $240.

0 - https://groupgets.com/manufacturers/flir/products/lepton-3-0