500 (huh!) yeah, whatever... (sorry about my sarcasm)
15,000 bells
round about 800 bells
1800 bells
2,500 bells
15,000 bells
All gyroids are worth 828 bells
If you mean at the flea market, that's impossible unless it worth a million bells
If you look in the Animal Crossing Community website, they will say that you will get 2,100 Bells if you sell a gold rose.
The king salmon sells for 1,800 bells.
A peacock is not an obtainable animal. If you mean the peacock butterfly, about $2000 bells.
To get Nookway you must buy or sell a total of 90,000 bells worth of items.
Dorado's are worth 15,000 bells and I caught mine in the river between June and September.