Fodder prices will almost certainly continue to climb or level off. Even if it drops, it probably won't be very much. If either flights ups their buying payouts or adds a big prize to their raffles, the prices for fodder will rise as well. I remember fodder was like 12k+ one time, it was insane (I think it was the Ice vs Shadow fight)
Your best bet for cheap fodder is to either grab 4 or 5 day old hatchlings and wait for them to age into adults, ooorr go sniping right after rollover or in the early morning. Fodder is cheapest and most plentiful at these times.
I bet hatchlings will soar to like 10k+ by the very end of the battle too, could be good for money making if you have a lot of lairspace to stuff full.