I heard if you buy the Pocket Operator 32 - tonic, you can have microtonic free ...is that true? I've been trying to find how to do that without success as yet.

No, not true. There used to be a bundle in the Teenage Engineering store that included Microtonic. But availability of that bundle was very scarce, so we offer a discount on Microtonic to match the bundle price.

https://soniccharge.com/forum/topic/976-microtonic-po-32-tonic-bundle