Are there hinges out there that I can use to convert my toilet seat so that it won't slam shut? Other methods?
Buy a new toilet seat. The big box stores sell several that are billed as "Whisper Close" "SlowClose", etc. We're talking $30-40 here (as opposed to $10-20 for a low-end toilet seat) so it's not like I'd be concerned with preserving the existing seat.