So today my girlfriend closed her door and the passenger side mirror on my car fell off. The glass didn't shatter, but instead broke into two big pieces. I see it was just glued on.

Are these mirrors expensive, and should i just gorilla glue the two pieces, or should i buy a new one? Can i even get them?

 

You can buy a pre-cut mirror piece to put right back on, comes with adheasive and everything, about $30 or so, do a google search for a site called hawks f-body parts, i forget their web address, but thats where i got one before, ebay might have one also for a bit cheaper

 

find someone on this site (or others) that are parting out and get one cheap.

 

You might check Autozone, as they carry some replacement mirror glass.