The new, fast, high density flash chips from the big name flash chip vendors are not generally even listed on the vendor websites. You have to talk to a sales

The new, fast, high density flash chips from the big name flash chip vendors are not generally even listed on the vendor websites. You have to talk to a sales person and convince them you're actually going to buy in volume to even get data on the latest generation of flash ICs. You will also likely need more than 50 friends to meet the order minimums, unless your 50 friends each want to buy about an ExaByte worth of flash chips. Also, with these multiple level flash technologies (quad level is current tech, triple is still used in some SSD/NVMe) the read, write, and ECC algorithms are non-trivial to the point where last I checked even mainline Linux's raw flash driver support won't do anything beyond single level cell flashes (and very few new embedded designs are choosing raw parallel NAND flash, instead opting for things like eMMC or UFS which have built-in controllers to handle this).