This is how to make your own mallet:
Get a golf club (longer shafts work better)
Get some self tapping screws (3/4 inch)
Get some scrap "cutting board" type plastic material (3/4 inch)
Shape the plastic into a mallet head with a jigsaw (or something like that)
Round out the corners with a knife (or something like that)
Put holes into the head with a drill and your favorite bit. Don't make the holes too large.
Drill a hole into the top of the plastic and insert the shaft of the golf club (minus the head)
Apply the self tapping screw.
DONE! (Takes about 20 mins if you take your time with the saw.)
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If you don't want to make your own mallet, go to one of the following places: