Breed your own and feed live. (I see you are already starting a rat colony.)
Really, as much as some people balk at the idea of feeding live prey, if you ask around most anyone with that number of snakes (or any reptile) will tell you that they feed live. It's too time consuming any other way.
Then again, if you are breeding your own feeder rats/mice you will be able to offer the prey in any prey state you'd like (Live, Fresh killed, frozen-thawed) and at your convienence.
It is important to have a feeding schedule and stick to it. I offer prey once a week...if it is not taken then that animal waits until the next week. Try dividing your collection up by days of the week.
If you have 100 animals try this:
Monday, Wednesday and Friday you commit to feeding roughly a third of your collection at a time (1/3 each day). That way everyone is offered food at least once a week. Anyone who refuses food won't starve to death in that one week period of time and they will be less stressed than if you poked in their rack every other day trying to get them to eat.
Other "chores" can be done in a similar manner. Simply determine how much time is needed for each and divide it up throughout the week.
Of course, there are things like fresh water changes and clean up after voiding and defecation that shouldn't be put off for a week.
I only have one water dish with each of my snakes. It is kept at the front of the rack (since the belly heat runs along the back side = less humidity issues). I have extra water dishes for everyone. I simply go around with a couple buckets.
One bucket is for dumping the old water out...the other is for collecting the "old" dishes. I then take a few gallon jugs (milk or water) and fill up each replaced water dish. The "old" dishes are thrown into a tub where they are washed, dried and put away for the next time I change water dishes (this is only done once a week).
Refilling water is done in the same manner except that I don't collect the dishes. I simply have one bucket for old water collection and my gallon jugs I use to refill everyone's dish with.
Doing this requires minimum disturbance of the animals since I only have to pull their tubs out a little ways. If I see that someone has defecated or needs their paper substrate cleaned I make note of that on a small pad and return to them when I'm done with the "Water Boy" rounds.
Otherwise, everyone is left alone except for feeding day (where their tubs are more closely inspected).
Now here comes my disclaimer: I don't have 100 plus ball pythons. I have had a fair sized collection in the past (30+) and this method worked well for me. I've since scaled way back (This is a just for fun thing now.) No I was never a "major breeder", maybe not even a minor one. But, this is what worked for me. Currently, my collection is small enough that feeding frozen thawed rats isn't too time consuming.
Just my thoughts...