Yeah, it can be pretty expensive. Some tips:

• figure out if you want a photography kit you can also use for astrophotography or something more dedicated to astrophotography like a telescope you can put a camera in.
• camera equipment is a lot cheaper used.
• A lot of deep space objects are most visible in infrared, a camera without IR filter can capture this but wont be much use for anything else.
• the old astrophotography reddit is a great place to learn about equipment tradeoffs as all photos are posted with equipment details. Makes it easier to learn what you can realistically capture and what requires 10x your budget.