Agreed on the nukes, as long as stockpiles last, they make a good black market commodity (however you can construct WMDs out of Hellerium as well). Also let's not forget about food and other essentials, artificial scarcity makes illegally dealing in these quite a business (although this stuff has low mass/value ratio).
As for superhumanly intelligent AIs, they could either be:
- Solidly-made digital slave-gods. Nobody has the scientific base to build these. It'd be like trying to build a moon rocket in the Ancient Greece, so no point even discussing these (and trouble they can bring).
- Shoddily made, but powerful digital AIs. Would be extremely prone to breakdowns. Might be an useful trade commodity, but their task are better performed by the AIs sold by the Star Gods.
- Sapient/Sentient, superhuman AIs. Well now, these could be raised with available tech, given some time and resources, BUT... instead of becoming a market commodity, they could very easily outwit their masters and become crime lords themselves. So no smart crimelord would venture into this venue.
- Augmented biologicals. Doable, as above. They were rich and powerful, or their retainers, to begin with. So cannot be merchandise, they're merchants or warlords. Allowed since near-immortality is allowed for leaders, which the Star Gods dangle before said leaders to assure cooperation. Quite possibly, bootleg augmentations and life prolongation drugs are a good black market merchandise.
- Biorobots. Not really on topic, since they'd be subhuman on purpose, but could - possibly - compete with Slave AIs, if anyone had the capacity to build (breed) these. Quite likely most reviled of all AIs, since they could compete with Star God merchandise.