Samsung SCH-N330

is there any way to set ringtones for a group instead of individualy? i have five different "groups" of people in my contacts, and have different ringtones assigned to each of them (one for "parents", one for "school friends", one for "other friends", etc.), but i can't figure out how to change these ringtones without doing it for all of my contacts, individually.

also, while i'm here, i need some sort of case for my phone- it gets really scratched up on the bottom when i leave it in the cell phone holder of my purse (which is just a sheet of vinyl, so it's really not that protective). does anyone know where to get one that looks decent and doesn't cost over 20 bucks?

thanks a lot.