Price is around $5 already. It would be a bit late to buy if it goes $6 before September end, grabbing 1K of waves is going to spend you more than what you ought when you buy now. Last few weeks was the right time because it was dumped that the price goes below $4.
Waves will deliver many new features in the near future, this means its a good investments now. Market will react on big news from the Waves devs and price will rise.