The cheapest I've seen so far is $130 PLUS shipping... so I think you got a good deal, especially since you got a bonus black Micron, which used to be $20-50 (being store exclusives), but ehobbybaseshop seemed to have quite a few of them.
On ebay at the moment, the Shadow Microns are about $30 each or $50-100 for the set of four... so don't throw it away if you don't want it. You might get at least $10 here for it.
It's free to anyone in melbourne that wants it. Pick-up only.