We give between $100-$300 for wedding gifts, depending on how well we know the couple and what we can afford at the time. That's between the 2 of us.
for our wedding most single people gave $80-$100.
on the topic of going to a wedding for a free feed-dh and I have done that before!! The whole family was invited to the wedding of mils friends daughter. It was at a really fancy wedding venue we always wanted to go too.
was a very weird wedding though, 200 people and they were all friends of the brides parents! The bride and groom had never met most of the guests! To make it even odder, the brides father was working interstate so didn't even come!
Mil did give them a gift worth about $500 though(she would have paid about $250)