with the playerbase so low, its is very hard to find someone to repair or implant things.
the price should be higher than players would take for the service.
maybe something like tl x 50 per implant and repairs tl x 20.
that way players can focus on more important things.
if the playerbase stays so low at it is now, you should consider to have merchants sell all kinds of implants, armors and weapons in artifact quality.
edit:
ok maybe artifact would be to much, but have them at least 100% and random 0-2 slots.