Ruby on Rails

I have an interesting problem that I'm trying to wrap my head around.

I'm creating a subscription based service that will charge extra for
premium products. What does this mean?...ok, let's say I've created a
subscription based service that allows you to get any 5 standard
magazines of your choice shipped to you per month, where a standard
magazine is any magazine that costs less than $7.99. Magazines more
expensive than that are considered premium.

Now if a subscriber selects a standard magazine, this is fine, the
order is created and the magazine is shipped, this order falls within
the terms of the subscription. However, if the subscriber selects a
premium magazIne, then I have to charge them the difference of the
magazine price from 7.99. So if they order a magazine worth 9.99, I
have to charge them 2 bucks, etc etc.

Now, I can't figure out where to put this logic check. What I've
started with was this. I created another controller method to check
the price, if it's standard, send to the create method(is that even
possible??). If the magazine price is high, I redirect to a confirm
page then back to the create method....this means that I have to store
my order in a session, right? Which just seems like over kill.

Has anyone had a problem like this before? How did you go about
solving it?

Thanks a bunch in advance,

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