the local feed store here has 50 ml vials (various brands) of generic injectible sterile 1% ivermectin for just under $40 (used to be just under $30 before it got popular) they also sell syringes from tiny to huge.
i use it orally… draw the dose from the vial with a syringe – squirt the dose into a shot glass – down the hatch – rinse the glass with a shot of tonic water, also down the hatch.
one ml of 1%solution is ten mg of ivermectin as close as i can figure.
look for a FEED STORE not a pet supply. go somewhere out in the countryside where you can see livestock in the fields.