Amazon recently complicated their ‘reload your balance’ checkout system: whereas previously it was all done with a single click, it’s now more similar to the standard checkout with a few pages to click through until final checkout.
Personally I like it better, but for those who do multiple transactions to meet a transaction requirement (e.g. on Everyday Preferred) it’s certainly more painful to do. Everything else about the balance reload is the same, including the $.50 minimum reload.
Reload your Amazon balance (affiliate link)