In response to your recent email about this product and with the open invitation to ethically hack the price I can confirm that it can be done as far as getting the payment transaction to get authorised by Paypal for as little as 1 cent - but obviously you have a check on the amount when coming back to your website in your thanks.asp page that prevents the download.

The ideal solution would be to use PAYPALs IPN to ensure a secure transaction, but your checking will work fine enough.