I believe I read a general( and assumed) breakdown of part prices as such: each saber has four parts: emitter, switch, body, and pommel. That of course is without any electronics at all. Now you can leave off the blade as without electronics it feels pointless. Taking the $150 prices from the KS campaign as the guide you can divide it by the four main parts which gives about $37.5 per part.
Taking into account variables and the fact that with all SF sabers you get a blade plug, it's probably safe to put a $30-40 price point per part. Certain parts such as the thin neck emitters or clawed emitters may end up being a bit more but we don't know at this point.