Tapped Out Stuff [S] e*g

You can buy donuts , money , exp and old items .

1 Item = 15 e*g
64 Donuts = 15 e*g

Look here for items :
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From which items i can choose? Every item i want, even the expensive ones?
And how does it work how do you get these amounts of donuts to sell 64 for 15 eg