alt Hacker NewsWeed disposables are a whole rabbit hole by themselves.
You want to buy a disposable? Ok, here, $20 and you're done.
But if you want to make the oil at home? Ok, $2000 for lights, timers, nutrients, seeds, and a grow tent. Plus another ~$10,000 for a basic short path distillation setup. And honestly to make anything close to what you get in the disposables, you'll need to hire an expert with experience. And you need a lot of space for your new secret lab. For 99.999% of people, it's super not worth it to make at home.
Your home grow prices are high (even setting aside that you can just buy flower instead of the disposable vape). The right range is hundreds of dollars. And I'm sure making good oil costs somewhat more, but you can make crappy dab sludge (wax?) with some scissors, $10 of isopropyl alcohol, and a baking dish ("QWISO"), and that sludge can be loaded in some kinds of reusable vape.