This may shock some people, but I bought some cricket related stuff I didn't really need the other day!
This time I got myself a used LV mallet off the bay of E last week for a mere £35 posted.
It was used and has a few cracks, but on first impression it does a superior job to the other cheap mallets I have used.
As Chris said, use a lighter mallet for the precise bit of rounding the edges, then away you go!
Mine is only a baby one, weighing "only" 855 grams, but I'm more than happy with it, especially at better than half price
How it looked after a coat of oil