How can you get free golf balls?

Answer 1

Green staked tree, Ground Under Repair, casual water, water in a bunker, animal burrow, cart path (check local rules though), embedded ball in the fairway, tyre print (from tractor or heavy vehicle).

Answer 2

It is highly unlikely that you would be able to get Golf balls for free. The only way you could do so is a promotion with a golf magazine or something. If you go play golf and find some golf balls you can keep them, however, you can't just go to a golf course and look for golf balls, this is illegal.

The issue seems to be perhaps you think golf balls are too expensive, there are a couple of options you could buy budget golf balls or buy lake balls, these are used golf balls which are a lot cheaper.