Donating

Hi, I wanted to donate for the bone link trinket but it costs 34 coins and for 30 dollars you get 33 coins only.

I was only interested in this item, and was wondering if there was a way I can buy 1 more coin without having to pay for tons more coins that I won't use as this is the only item I am interested in?

After you have donated at least $100 you start getting bonus coins from donations and would get 34 instead of 33. Til then it's not possible to buy 34 coins.