Unlike pennies, I use dimes enough that I would prefer they be kept around. Rounding prices to the nearest penny is OK. Rounding to the nearest quarter, less so.
We did it in Norway, many years ago. Buy a few apples and something that costs x.99, the sum is then y.53 or z.17 and it's rounded to a sum that can be paid with coins. End of story.
Seeing compulsive $xx.99 marketers adapt to pennylessness could be amusing.