Pool Frog Chlorine Cartridge - $50 (Berea)

Pool Frog Pac 540C 6.
16 lbs.
, Replacement Chlorine Cartridge, for use with Pool Frog XL PRO Pool Sanitizer System.
Product # 01-03-5613 Sells on Amazon for $80.
I have 4 available for $50 each.
Cash only.
No returns, no refunds.
These are unused, unopened, completely sealed containers.
(stock photo used)