DivineWrath
Banded Mongoose
Well, if we don't have rules for second hand equipment, why don't I make something up quick and dirty...
For quick and dirty, I'm aiming for a single skill check. If you want something with multiple skill checks and many tables, go write that yourself (I'm not interested at this time). Maybe a single skill check should determine how good of a deal you get. For each point of positive effect you get, you can get a 5% reduction in price (an effect of 3 should get you a 15% discount). For an effect of -1 to -3, you can't find anything. With an effect of -4 and beyond, you get something with a discount (5% per point of negative effect) but it comes with some problem you can't immediately identify (maybe its hot right now, or it suffers a serious structural defect). The type of skill you use should determine the source of the parts (Streetwise for possibly stolen weapons, Mechanic for stuff at a salvage shop) and determine how well you can spot problems.
This ad-hoc rule assumes that getting stuff new isn't much of a problem, otherwise you might be dealing with problems of higher prices due to demand (which isn't what this ad-hoc rule covers).
For quick and dirty, I'm aiming for a single skill check. If you want something with multiple skill checks and many tables, go write that yourself (I'm not interested at this time). Maybe a single skill check should determine how good of a deal you get. For each point of positive effect you get, you can get a 5% reduction in price (an effect of 3 should get you a 15% discount). For an effect of -1 to -3, you can't find anything. With an effect of -4 and beyond, you get something with a discount (5% per point of negative effect) but it comes with some problem you can't immediately identify (maybe its hot right now, or it suffers a serious structural defect). The type of skill you use should determine the source of the parts (Streetwise for possibly stolen weapons, Mechanic for stuff at a salvage shop) and determine how well you can spot problems.
This ad-hoc rule assumes that getting stuff new isn't much of a problem, otherwise you might be dealing with problems of higher prices due to demand (which isn't what this ad-hoc rule covers).