If you can't find it elsewhere and don't mind the horse paste...
https://www.jefferspet.com/jeffers-ivermectin-limit-100-tubes-per-customer/p
These people want medical for human grade, they are not fully on board as we are.
Jeffers also has the injectable swine version, which one can just inject into a glass of water and drink.
That, IMHO, is the better way to go if one actually gets the ‘rona. Save the horse paste for weekly maintenance.