I didn't realize they'd already done second runs for Munitioner and Explorer.
I just know that they seem to be once again re-releasing DIA Commander and recently re-released City Commander (one time out of many re-releases for that one) along with Warbot Defender and I think they even re-released Protector a while back.
The Munitioner and Explorer along with Superion were the only ones that I thought they hadn't reissued yet.
The secondary market sucks for them right now (way inflated prices and very few available) but there's still an ample supply of those Energon figures and their many repaints that work with the sets (it doesn't required the RotF set for Bruticus after all, nor the RotF set for Superion).
edit: this is what I'm talking about. Another run of the Asia exclusive DIA Commander, Protector, City Commander and Shadow Commander and each and every one of those is way more readily available on the secondary market than Munitioner and Explorer.