For those needing to buy some biocide, our local Camping World had a couple of 8 ounce bottles of Biobor JF on clearance for $4.63 less 10%. We bought what appeared to be their last 2 bottles, but others may want to check their local stores for inventory.
No affiliation with CW and we only use them to buy supplies. We had stopped to pick up our winterizing antifreeze rather than wait for the cold weather purchase rush.