This whole week I was looking for a good turnip deal and in the whole week they were between 50 and 130. I had to sell them today for 60 bells a piece when I had 100. Can I do anything to control them?
No I'm pretty sure that its completely random. Mine usually sell for around 80, but just a couple weeks ago, Nook was paying 950 bells for each! I made about 500,000 bells that day.