Do not try to find the cartridges locally -- too many folks are selling the 'identical' cartridge, when it's not 'identical'

Amazon is out of stock -- of a LOT of pool gear -- and has dropped back to secondary sellers. I would NOT trust those to send you an actual Unicel.

Just use what you've got, and wait a week and try again, with the link I gave you. Given the fact that your filter was filtering, I'd recommend just putting a new 'B' back in, and using that.

-- gotta go back and re-read your thread; I'm confusing it with another similar one! --