A lot of people swear by gelatine, but I'm assuming you've tried that and had about as much success as I have (not much). Apart from cold and time as another user mentioned, have you considered just dry hopping less? Back in the heyday of crystal clear West Coast IPAs those hopping rates would have been considered crazy, even though they're mediocre these days.
This year is probably a good year to come, our currency is in the toilet so it's cheaper than usual.