When I was following prices in anticipation of buying in, I stumbled across some data presented on the Fidelity resale blog which followed the prices over a couple years period of time. One of their conclusions was that resale prices dip in February. This could be the trend you are seeing. We purchased at the end of January as I noticed the best price
I had seen on a 100 point contract in many months, $80 for 100 points at SSR. I think I agree with their point data in my own experience!