I'm not sure how you're getting $850.... I just tried $800 with 2 fertilizer bombs and they wouldn't move. $775 and they're finally moving. Like I said with no fertilizer I priced them at $600 on a Friday and when I got back to work Monday, not a single one sold. I also have every garden upgrade available so if that plays a part, then that's not the issue. Maybe there's a magic plant that inspires people to pay more that I don't have? (I have 4 of 6)