I have a player who's char concept is a street level arms dealer who's got in trouble with the mob. Owing them a lot of money from a deal gone bad, he's turned to running for some quick cash.

That, in and of itself, I have no problem with. What I'm endeavouring to do is cover myself incase he decides he wants to make the odd deal between runs. As far as I can tell, per the rules, he's going to be buying at streetprice and selling at 30% of base price. Now, that's buying from and selling to a fixer, which obvously isn't what I'm looking for.

After thinking about it, I've come up with 2 options. Actually playing out encounters where the group scores a large volume of cheap weapons (AKs and the like) at cheap enough prices to make fencing worth while and some sort of "Criminal Day Job" quality to represent a ongoing small scale deals.

Is there anything in the rules I'm missing, or alternatively, does anyone have any better ideas?