I am se very sorry for your loss. My bengal has IBD as well. He is 11-1/2 years old. Here is a link to breeders in California. The state is long and you're in the middle, but hopefully you can find a good breeder near you.
https://bengalcatclub.com/bengal-cat-br ... alifornia/ Quality Bengal Kittens is a collaboration between Solana Ranch and Wildernesswell and both have been breeding a VERY long time.
Most on the list have been breeding for a very long while and offer beautiful, quality kittens. They all have websites you might want to visit. Phone numbers are also listed if you want to call and speak to them.
Know that many bengals have health issues -- due to the early (and continuing) inbreeding. The majority of breeder lines started from Millwood way back in the 80's. There is no 100% guarantee that any bengal kitten you purchase will not develop something during their life. You appear to have gotten unlucky with bengals that have not lived long, fruitful lives. It's great that you want to continue with the breed.
Just make sure that the breeders tests for EVERYTHING. HCM, PRA, PK, FeLV, etc. Usually if the parents are clear, the kittens will be as well. Know, too, these breeders will have their available kittens posted on their website and you just might fall instantly in love with one.
You never stop grieving for a lost pet. Hopefully, a new one will fill the void you now have.
{{{HUGS}}}