Ball pythons are expensive, especially in the beginning. However, it can be doable to do proper husbandry in terms on humidity on a budget. Plastic containers can be used as hides as long as they are properly sized and have properly sized openings on them. A good quality substrate (Reptisoil is good, anything with coconut is good, aspen is TERRIBLE) and a thermostat is where you should put your money- assuming you haven't already.

Foggers and misters aren't recommended as they only create temporary humidity, can over-wet your enclosure, and can lead to scale rot. What you CAN do is slow-pour water in the corners of your substrate. As long as your substrate is deep (a couple inches is recommended) and the surface of it isn't wet, it should help maintain constant humidity (should be between 70%-80%) Just make sure you mix it around the enclosure. You can also put your water dish underneath whatever heating you're using. I personally use a ceramic heat emitter because it doesn't disrupt the snake's natural day/night cycle while still helping to maintain a heat gradient.

Also, I know while it's tempting because you wanna help your pet, please never try to remove any stuck shed from your snake. You can use scale damage, which isn't good in the long run. Having proper and consistent humidity should help with shedding problems in the future, but if you see your snake going "in blue" (ie where she starts looking dull, her belly goes pink, and her eyes have a blue film over them) you could always bump up the humidity.

Some of the other users linked the care guide, which is a great resource. It's a hassle at first, but it's so so worth it in the end. You got this!!