Depending on how comfortable you are with ordering online, you could switch to buying your prescription that way. Personally, I used
www.inhousedrugstore.com for nearly 8 years to buy my Diane-35 (just went off to TTC) at a much reduced cost and the service was flawless. I would buy 6 months worth of Rx at a time. Never got an order late and they don't require a prescription. I just ordered my pills and brought them in to my doctor to make sure it was exactly what I needed before using the website regularly.
If you don't like InHouse, I'm sure there are loads of online sites that sell Yasmin at a reduced rate. Just make sure you show the pills to your doc to make sure you are dealing with honest vendors. Maybe I'm just the paranoid type, but that's what I did to make sure I was getting good product before committing to a online pharmacy.
I saw Yasmin on InHouseDrugStore, $60 for three months supply.