In the thread sinner linked to earlier this was mentioned:
"Transbridge Omegalock Yes, we have confirmed with XTB the limbs price will be the same for all of the early birds, the torso's price not get finally confirmed yet, but it will also be incredible cheap"
Transbridge Omegalock seem to be some online store so I dont know if this only applies for them or for any store selling the limbs, but if it's the latter this would end up as a pretty cheap MP sized 3P combiner team