What's a good $$ donation for a wedding gift?

[NT!]

depends on the general financial situation of others, too. i went to a wedding with some young friends - they got married while still in grad school. most everyone there is a student and is kinda broke. i got them a some nice knives (they weren't registered anywhere) - spent like 100 bucks and it was twice the price of anything else our friends got them. felt a little weird.