BP substrate

[Homebody]

...would it be okay if I used mulch from there just this once, until I can get some money?

Nope. I don't know where you live, but, in the city where I live, they put down rat poison the mulch. I kept my bp on newspaper with a humid hide for a year. He shed perfectly every time. Obviously, with newspaper, you need to clean up waste promptly. And at that time, I was keeping my bp in a sterilite tub, so I didn't need a particulate substrate to help retain humidity.