So, Vets Pets is originally the place where I got this ball python from so I was thinking if they would be able to help me out with his sickeness? Like if they can treat him with some antibiotics? Or do they just sell animals ?

Pet stores can no longer carry any kind of antibiotics. Topical creams and such are allowed but the government cracked down on the easier access of antibiotics a few years ago. It kinda sucks.

So do you guys think that the smel of vapor rub will be toxic for him ?

What is wrong with the snake? And how long have you had it?

The pet store has basic animal first aid products (i bought some wound antiseptic for my Leopard gecko there) I believe they have a location across the street where there are veterinary services.