That all depends on when and where you are going to camp. All the camping gear for winter costs more than a warm summer park or beach. If you are summer camping you can get a cheap sleeping bag for $40 or less, tent $50 or less (for one person) a LED lantern for $20 or less. Then you can avoid cooking gear and eat out of cans of food or MRE's (meals ready to eat. So if you do a web search such as Amazon you could get everything for under $200 including water containers, cooler, drinks and trail mix. But if you are camping in near temps near zero it can cost you up to $500 or more.
I have camped in temperatures from 48 below zero to 115F all over north america from Alaska to Panama for over 55 years and still camp in Alaska around bears and I'm nearing 70 years old. Do your research so its fun. Don't forget the bug spray!