I have a 5 year old Ball Python and I have moved to an area that does not have anywhere to purchase live rats within an hour and a half

So now I am needing to switch from medium to live rats and am not sure how to go about this. I am guessing that you don't just throw them in and hope they eat them, so any advice on where to purchase them with the least amount of shipping (I'm in New Hampshire), as well as how to actually feed them to my snake would be great!

Thank you in advance!