Might as well start building a rack. You're going to get there very quick. I got up to about four freestanding tubs of rats when I had about 10 ball pythons to feed. Now that I'm at 15 snakes, I definitely need the racks. There's a few different ways to build them and it's not too hard or expensive. One is the cement tub rack. Another you can use those same kind of tubs and have shelves where you slide the tubs in and out.
That tub is going to be a mad house when you have several litters of 2-3 week old babies running around. Plus with dividing them up into racks, you can divide the females into groups of 2-3 and rotate the male through. Your females will be better off getting a break after babies and you won't have one massive population boom from a bunch of babies at once.
It's also good to get in contact with other local reptile keepers. I have a guy that has a burm and a retic that won't switch to bunnies so I sell him my retired females and rats that didn't get eaten before they got too big for my snakes. And before that (and before I moved) there was a local guy I gave all my extras to before they got too big. You'll come across a bunch of your snakes not eating at once and wonder what the heck to do with all the weanling rats before they get to big in a few weeks.
And welcome to breeding your own feeders!It's a learning curve for sure. I find it pretty rewarding. I really enjoy breeding the rats and mice. And the racks make cleaning/feeding/organizing/etc so much easier.