I know this an old topic, but I found it when I did a Google search on Pronto filters. I just wanted to comment that RockAuto sells these filters and the one for my Corvette only costs $1.57! I'd never run it, but I'm amazed that there are still oil filters out there selling so cheap! They also sell a Mann oil filter for my car for just $2.21, and the Bosch Premium is $3.61!
They sell the Ultraguard Gold for just $8.35, it's too bad that the shipping charges to get it up here outweigh any savings I'd get on these cheap oil filter deals.
2005 Corvette (M1 5w30 & Fram Ultra)
2006 Civic EX Coupe (M1 0w20 & Fram Ultra)
2010 BMW 328i X-Drive (M1 0w40 & Mann filter)