I would suggest making your own. You will learn the location of the muscles very quickly, from there it's the challenge of memorizing your origins, insertions, and nerve innervations. I would bet that your professor will teach them slightly differently than what you find on any flashcard. I became frustrated with using pre-made flashcards, because the info I had to know for class never fully matched up with what was on the cards. So, I ended up making my own for O's, I's, and N's anyway!
Good luck!