The spawn rates in general are lower this year but if your whole island is clear of clouds and you catch enough spawns you should be able to find enough over time. If you'd just like to complete your quests and not profit madly or lose your shirt completely try trading what you have, currently bells, 1:1 for what you need and just ignore the loony offers as much as possible. Straight up 1:1 offers usually go quickly, especially if they're posted in smallish amounts.

