In Rigger 5.0, several drones are mentioned to have available variants with Realistic Features built-in (or in some cases, higher levels of Realistic Features than the default model). Okay. So what do they cost? Are there any non-English splatbooks stating these prices, or splatbooks from previous editions that would provide useful points of reference? Yes, I can calculate what they cost as modified drones. I can also list the various drones and vehicles that cost less than adding their standard features to a comparable drone or vehicle; I think we can agree that there's a precedent for standard features to cost less than equivalent modified features.
Unrelated, but how do I modify a Festo Sewer Snake so that it can bite people and inject them with venom? I have no immediate plans to assassinate someone and make it look like an act of nature, but you never know when you're going to get a wetwork job....