It actually depends on how badly you want the kit.
According to Kurama Toys, they already had 2 batches sold out, so that meant that Bandai had done first run and upcoming second run for this month.
Now Premium Bandai USA, aka Bluefins, indicated that shipment is scheduled for September. That might be part of the second run or maybe even the third or fourth run. So it is likely they will have more later on. Though looking at the past 2, Liaoya Shenlong and Heavyarms Igel, they were still available on Bluefins as in stock, well as of last week anyway. Bandai might not produce as much of Deathscythe Rousette or maybe Bluefins do not want to import that many to sit in their warehouse. So it is hard to say at this point.
With upcoming Sandrock Armadillo, they might do at least 1 more run before the end of the year.
Anyway, saw a review of it, and Rousette definitely features modified backpack wings from the Wing Gundam.
Will check some sources for you. But at this time, the price is not good.