How Many should we keep?

[Beardedragon]

My daughter & I started to breed our own mice for our King & baby Ball.
We don't mind the breeding of mice.
But, we do have an abundance & found that there are not many petshops here that sell feeders.
If I were to go on Craigslist & sell mice. How many should we keep
to keep up our supplies? We are also willing to sell some as pets too as we have many types of what are called fancies here.
Also? How old is too old for a male to keep for breeding?
We've got a beautiful Blond/red male who is really just stunning with his colors.

Keep enough to substain your current snakes, it all depends on how many you feed them a week.

Id sell them at around $1, many places sell them for $2 but I think thats too much for one tiny mouse...

Males will keep breeding untill they die, but id keep back some of his sons once he gets older.