Anyone know where I can get a bunch of adult diapers for cheap?

at the moment i use hdis home delivery for my mama's underwear. the home deliver using fedex. for 2 casea i pay 129.29

Any store that buys in large quantities will have the best price (Walmart, Costco, Amazon etc.) Careful of online retailers, while they will deliver to your door they also can be more expensive.

I look for coupons in the flyers that come with newspapers. I found Walmart and Kmart have cheaper prices. I also wait for sales and use the coupons too.

My husband buys by the case on Amazon for my MIL. Best price we've found.

If you live near a Costco or BJs, then you will find big discounts. Today on Amazon, there large size adult diapers for about $1.25 each. (you have to buy 32 @ time.
Here is a tip I use when shopping: I "know" approximately the least I can pay per unit, e.g. $1.25. This is my reference point. Then when I see a sale, I judge the sales price against my reference point. Lower than my reference point, I buy them. If higher, I don't. This helps me save money because stores and online outlets are always changing prices. I keep a list of low prices in my cell phone. Remembering stuff like this is much harder as we age.
Some people don't believe in stocking piling items, like adult diapers or toilet paper. But I do for two reasons. 1. I always have them on hand. 2. I saved a substantial amount.