Molds intended for large production are expensive, but it's going to be expensive no matter where you do it (and can be procured internationally if you want). If you're making something with injection molding, you will need a mold.

(Aluminum or even SLA tooling is possible for smaller batches). That said, even good steel tooling does not necessarily cost above low 5 figures. It all depends on what you're trying to do.

Real injection molding machines are $10k-300k, depending on what you want / need. This is not very exciting or scary from a capital expenditure point of view. Yes, you can spend a lot more if you're producing a -lot-. That $200k machine can get you to thousands of shots per day.