So I purchased my ball python, and I will be getting it in may her weight is in the 200-300 gram range, and the most affordable way for me to get mice is to buy frozen in bulk, so my question is what size rats should I buy If I plan on buying around 100?

I plan on feeding her twice a week until she is about 700 grams then once a week. This may seem like a lot of mice to buy in advance for one snake but this is really the best way for me to do this with shipping being as much as it is.