11449 Simple PHP Script Fix

I have three scripts, all pretty much the same. Real Estate - [login to view URL] Auto Sales - [login to view URL] Classifieds - [login to view URL] I am having the same problem with all three scripts. I want to be able to offer FREE services. When you login to the admin section and create a free listing, it works. But when a user tries to post a listing and chooses “Free Listing” it still asks them to choose a payment method and tries to bill them $0.00 via paypal. I need this error fixed online, as well as in the hard-copy so the next time I install the scripts they don't give me this problem. Also, two of the three scripts offer real-time banner spots for agent accounts. This costs no money. I would like to be able to charge for these spots, or at least be able to approve/disapprove them before they go live. Or be able to enable/disable this feature from my admin for obvious reasons. Where I couldn't add a free post, I logged into the admin and added a listing manually through the real estate & auto sites. Only the auto site listed something when I did this. And only as a featured ad on the main page, you can't find the car in its category. With the realty script, you can't see the post period. But if you login to the account, it shows the listing no problem. If someone can fix this ASAP, I'll be happy to give you a 10/10 rating and a good review.