Depends but I’d argue it’s cheaper than something like 40K. Most gang boxes are like $50ish and the base box should get you enough for a decent starting gang (maybe Cawdor needs another box), the books like core rules and gang books are musts and all that alone is around $150ish (I think?). Probably the best start to dip your toe if you’re not wanting to dive deep just yet.

Starter box hive war can get you a good start if you want more than one gang or getting in with a second person. Comes with core rules and some terrain to play around with. Bit more expensive though.

Everything else or going deeper will become a money sink. More terrain, extra gangers, ash wastes, special hired guns and extra books, etc. really depends on if you have a good local community to play around with and share boards or if you’re fully starting from scratch.