Honestly - it kinda depends on your area. I've seen QA models down to $515 new at Houston gun shows. But, prices can be regional.
If it were me, I'd wait. QA models are very easy to find. I'd wait.
A/S prices are all over the map. I paid $565 for my last fullsize A/S. But, anything below $600 would be good for an A/S. No way I'd pay that much for a QA.
Just my 2 cents...