Jen, I personally worm my cows twicw a year, i use ivomec plus, but ivomec has lost its patent right and now i think that the name is cydectrin, you can purchase this online or from some of the vet supplies, or at your local farm store. If you only need the wormer, i have used safeguard pellets, very easy to use just add it to the feed, but have to watch the Hogs in the bunch. I usually use that on the bulls, during winter month that way i dont have to pin or squeeze for the injection. The pour on is also avaliable. I really don't know of anything that is cheap, and still works, other than the cydectrin, i think that its available in pour on only. Sorry!
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