ticket discounts?

[think*tink]

I am wondering if there is a discount if you buy your tickets on-line vs purchasing them at the gate? I already have a preferred annual pass and we have to buy my husband and 2 daughters their annual power passes. (Only need one preferred pass to get the discounts.) We purchased them two years ago with the Fan Club Card but I don't think you can anymore. We leave on Nov. 23rd so I better get this figured out soon!! Thank you, any help would be appreciated.