Both Subscriptions and Single payment on one form

I have a form set up to purchase dance classes at a dance studio. The parent can choose from 17 different classes to sign their children up for dance classes. each class carries a monthly fee. This year a class was added that is $20/month plus a one time $100 fee for the warm up suit. Is is possible to set this up so if they choose the class with the one time fee, everything gets submitted to Paypal properly? For example, If a parent chooses the first class, it is $61.20/month recurring. The second class could be the class for $20/month + $100 warm up suit. The total monthly recurring would be $81.20/month, but $100 would be collected just one time.

I'm stumped on this one. Thanks!

Thanks for the reply, Rob! Yeah, I couldn't figure this one out. I'm sure some coding that's way above me could accomplish it, but I just ended up setting it up so when that particular class is selected, the product for $20/month populates with a note in red that they will be billed the $100. I was wondering if there was a way that after they submit to PayPal, they were redirected to another form with the $100 fee. The only problem with that is that it would have to be set up to only do that if they purchased that particular class which I don't even know if it's possible. The owner doesn't have a problem billing the purchaser, but it is an issue that I wanted some feedback from others that know GF better than me. Thanks again!