There are heaps of alternatives to bust that plateau but first you need to know existing programming. There is more to it than slapping on some weights and going for it.
Generally speaking most gym goers cannot high bar squat correctly due to muscular imbalances from the thoracic region to the calves and ankles. If this chain and complex isn't mobile you'll have not...
They are everywhere in Australia but supply is limited during competition season from experience. Every Coles or Woolworths I go into has the stuff. They even now stock free-range egg whites. :)