ZWO just started their summer sale with discounts on a lot of their popular cameras both for DSO imaging and planetary imaging.
The sale includes everything from the ZWO ASI6200MM-Pro down to the ASI1600MM-Pro. Some even include kits with filters and filter wheels. The ASI294MM-Pro camera is a great deal right now and has been well reviewed. On the planetary side, the cameras range from the 120s, up to the ASI462, which I use.