Ivomec can be bought at a feed store here-50 ml bottle for $32.00 US. He certainly IS ripping you off.This product is the same as Ivomec-the patent ran out on Ivomec, and now other companies can sell it. I get it on Jefferslivestock.com I don't know if you can have it shipped to Mexico, or maybe it is very $$
in Mex. Check out feed stores, if there are any.