Cost of Christening

Just wondering how much everyone has spent on their baby's christening parties... I'm having it at my mom's house and am trying to figure the costs. Haven't planned a party since our wedding and don't know which way to go.
It's our first baby so I can definitely see spending more on this party than ones in the future but I don't know how much is too much.

What did everyone do? Vendors and favor ideas would be appreciated too