https://ball-pythons.net/forums/show...ing-Guidelines
Here is a feeding chart to help you out.
Unfortunately it's too late now, but you obviously didn't quarantine when the second snake arrived.
I don't mean to be a jerk, but if you can't afford to buy equipment for the animals why'd you bring them home? As keepers it's our responsibility to provide what they need. It's also important to have money stashed away for emergency vet trips, equipment failures, etc... Otherwise they shouldn't be brought home.
I'm sorry the breeder you got the spider from was dishonest. For him to tell you one day the wobble isn't bad to telling you another day that he was a rescue nobody else wanted was extremely unethical and I would never do business with that person.