I have one large female BP that will take the smaller retired female rats without any problems.

My problem is with very large females and males.

The options for me are local herpers with larger snakes and the exotic pet store near me, and that's about it, I have a Blood but he is a late 08 so not big enough yet.

I think your best options are trying to find a local herper that might need large and x-large rats.

Getting a boa if you were planning on it anyway is not a bad idea just don't get one just for the purpose of disposing of your feeder and remember that is you do it will be a few years before he can take down your retired breeders.