Where's a good place to get this stuff under $20?

At Durvet, we are your premier supplier of high-quality animal health care products. We recognize the value of keeping your livestock as healthy as possible during these uncertain times. Included in this post is a coupon for $1.50 off of Durvet’s Ivermectin Paste, which provides effective control of large strongyles, small strongyles, pinworms, ascarids, hairworms, large-mouth stomach worms, bots, lungworms, intestinal threadworms, summer sores and dermatitis in horses. Valid at all participating retailers.