While notwithstanding the $12 that still shows as its price at this time on the VersionTracker page and the $15 price that appears if you try to do a straight order from the developer's Web page for ordering Saft <http://haoli.dnsalias.com/Saft/Order/>, that same page has: "To upgrade and manage your download accounts, please go to the account management page.".

For me, from that account management page (which shows me currently licensed for Saft_Leopard), when I click on the PayPal link under "Upgrade via PayPal", I'm presented with an $8 unit price for "saft_snow_leopard_upgrade".