[AlexanderHowl]

Well, LC1 weapons and ammunition are incredibly difficult to acquire in most settings, so I doubt that even rebels will be getting their hands on too much of the good stuff. Even the average stormtroopers is probably not going to be walking around with anything worse than LC2 unless they are expecting to face people in battlesuits. Streetwise is not normally enough to get LC1 weapons or ammunition, you need people in the secure factories redirect crates or raids against heavily fortified Imperial armories.

In general, the rebels are probably going to make do with what they can steal from the enemy or purchase from the black market (which is stolen from the enemy). If someone wanted to purchase something on the black market, I would penalize them by 2 × (CR - LC), with the cost multiplied by 2 × (CR - LC) (Minimum '1'). So, trying to get HEMP ammunition on the black market in the Empire would roll against Streetwise-10 and would pay 10x as much for the ammunition as normal even if they did succeed.