I had mine changed for 435$ taxes included. 305$ for the alternator itself (280 + 25 for the core, mine was cracked) plus labor.
Oh wait, that's Monopoly money, er.. canadian funds..
According to XE.com, 312$ USD.
Mine is a Duratec, they had to remove the wheel, splash guard, driveshaft, and I think the left rear door on my girlfriend's Honda.. j/k
I won't have the garage until October, I thought I could do it, but I'm not so sure anymore, after seeing this..