I've seen diaper prices increase too. Frankly, I'm not surprised - the price of everything is increasing!
Two things that might help...
Shop thrift stores, like Goodwill and others. I've found bags of Attends, 24 count, for 5 bucks. Now granted, the diapers I find at thrift stores generally aren't the best. (Even Attends are low quality these days.)BUT... If you just need a light weight diaper for around the house or short errands, I find they work ok for me.
Second... Maybe cloth diapers might fill the gap in certain circumstances?? Since I've been a bedwetter longer than I've had daytime incontinence issues, I've used cloth diapers with plastic pants at night for several years. Now days, with prices going up, I'll use a cloth diaper during the day, if I know I'm going to be around the house all day. Heck, with the right pants and long shirt combo, I can even wear a cloth diaper/plastic pants out in public without it being noticeable.