Although online you can buy the parts separately, in apple's service channels the hinges come attached to the displays assembly which apple sells at $900~ premium plus they quoted him the upper case so there's your $1,200.
OP open the mbp before replacing parts and make sure The hinge is ok if not the work you will do will be half done since the display will never close like its supposed too.
yep, sounds like apple. i took a sony vaio to afghan with me and replaced the screen before i came. lcd was separate and went into a bracket with 6 screws. so im not surprised apple would do something like that. too easy for people with common sense to repair so they make something you have to buy specifically for apple. i love my MBP but im prepared for this kind of thing with a cheap pc just in case. sorry OP, sounds like its $1200, or a gerber and some dings forever.