All current agents are discontinued items. The longer there are no operations, the less agents there are. However, the rapid increase in the past week does seem a bit weird.
I've actually been tracking this. The deviation is quite minimal from where it was actually. This is because a bunch of people, including me, still have access to trading on Buff, it prices diverge, then profits can be made very easily. Arbiratgers, so to speak, are very common to close any price gaps.