I guess my options are to now buy an Ikon pass at very high summer prices, pay the ticket counter rate, or miss the gathering.
Sorry to hear. I hate it when inefficiencies happen too. Not to kick you when you are down, but just wanted to throw out some more ideas for you to consider:
There is also option to buy the iKon session pass for only the 2to4 days that you want. That will be closest to the lowest 4day perday price avail ($469 ~$117/day), and cheaper than window/buddy pass rates (25% off $229/$249/$269 rack rate=$170+/day)
Also, based on history, in fall through at least Dec, there should also be a Palisades-only 4pack up for sale even after iKon sales stop, but that will likely not be better than current pricing on ikon 4pack. That will be the best option if you want to ski exactly 4days and are a last minute planner (maybe ~$130 to ~$160/day).
This may morph to a 3pack at some time in early Spring after pres. day ski week, maybe in time, but may not be significantly cheaper per day (maybe up to $20 less), more about just less days. That's really threading the needle though.