See if there's a pet food supply store in the area that sells their store brand of litter in bulk. (The type of situation where they sell you a first bucket, and then you bring back the empty bucket to be refilled for a set price.) If they offer non-clumping litter, ask them about doing a bulk purchase of their litter in the super sack it is delivered in.
We did this for our Kitten Foster Program, although we get the clumping litter. It comes in a 3,000 lb sack and they're nice enough to deliver it to us on a pallet (it helps to have a relationship with the store so they're willing to help you) when we need more. You'll need a place to store it, and there's a bit of work involved breaking it down, but the savings are well worth it. We get ~135 filled jugs out of each super sack.
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chris zorzi
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