I also would have given them the same Cost and Availability as they had in Arsenal (Avail 2, 100 nuyen). That's not official, since I haven't had a chance to knock that around with Jason yet, but I don't see a reason for it to change.
As for Renfield...well, you're not gonna just find that on the street under normal circumstances. They lack a cost for a reason: You can't just buy this stuff on the street. And really, why would you want to?