Talk to the doctor's office. They can likely get the lenses for you, and it won't cost more than what you're paying now. Also, make sure they do a vision test after you put the contacts in (which I'm sure they are doing).

Depending on how bad the astigmatism is, and how thick the lens is, if you've never worn Toric lenses before, it may take a week or so to get completely used to it.