Silver cowbells

I have so much Silver and Gold cow bells. But I can do nothing with this bells. But I need Bronze bells. That is so annoying. 😖

I usually use them to make stuff in the bait shop .. they need to have stuff on sale that you can buy with them!

Thanks for your answer!
No I don?t have anything to buy for Silver und Golden cowbells. Only for Bronze Bells.
 Why? 
And I have so much stuff from fishfarm.