Hello again helpful GURPS people!
I’ve been doing more reading and working to get the foundation of my first GURPS Cyberpunk campaign put together, and I ran into a bit of a conundrum. When players are putting together their characters, are there any rules about how implanted weapons differ from weapons used normally? Like if a player wanted to use a mono-wire whip that costs $5,000, would there be a different cost for having it implanted in their hand? Or if there’s a chip they could get that allows them to use a power like the sandevistan, I don’t know how to handle that since powers are point buy but it would also cost money…? I’ve tried looking in the books for any rules or recommendations, but if they exist then I think I’ve missed them.


There’s a couple places you should look for help:
To go further beyond just recommending sources: the answer is kind of hard. Gurps doesn’t make a great distinction between cash and points, least of all because you can buy the Wealth advantage that gives exponentially more cash for a linear cost of points.
This is also confounded by equipment getting better by TL: a 5d pi Innate Attack is amazing in Rome, but it’s an Assault Rifle in contemporary America. Some people recommend the Accessory perk if such equipment is readily available at a given TL, but also there’s the Extra Arm and Payload advantages as mentioned. These are only useful if the equipment already exists, esp as a weapon though. Sandevistans are basically Altered Time Rate… and AFAIK there’s no equipment readily giving that, at least at TL9 (which I guess you are). You can totally just create it and price it with cash (Meta-Tech helps with that); if it’s too rare, unique, or powerful you might want to charge points for it though.
There’s a lot more subtly to the ideas here, but hopefully it’s enough to at least help with any issues you had (sorry for the 17d necro, but I figure I could weight in at least for anyone reading this in the future, if not for any problems you’ve had since then).