As noted above, sometimes replacing retained bearings in the lower race with loose bearings will mitigate the problem. Another cheap fix is to pop off the crown race or lower cup and rotate it slightly before reinstalling it so the indentations don't line up top and bottom any more. Both these are at best temporary fixes, but you could go many years before the problem reappears.
If you want to replace the headset you need to either find a new one of the same brand/model, or one with the same or lower stack height. If you have 38mm or more of stack height you should have at least a few choices.