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Steve Miller recently published a blog post on how to make an Ecommerce Donations Widget. You can find it here: Sitefinity Ecommerce Donation Widget. I think it will be helpful for you and other people who are looking for this specific functionality.
You can take a look at this module in the marketplace to tie events module with ecommerce (there by using with a "donation" product") www.sitefinity.com/.../events-registration-widget .
The source for the donations widget is open and is hosted on Github at github.com/.../SitefinityDonation , we will try to compile it for 5.3 version soon, but in the mean time you can fork the repository and compile the code to the version of Sitefinity you are using.