Received a last minute wedding invite, how do we 'gift'? **UPDATE PAGE 2**

FH and I just received a last minute wedding invite, that wasn't in English and had absolutely no information whether or not there was a reception after the 'civil ceremony'. The wedding is literally in two weeks and FH's mom oddly called us yesterday to see if we were planning on attending, FH declined via phone to her to pass on to the bride and groom. The invite is for a good friend of FH's family that FH is not particularly close with and that I've never even heard of or met. FH's mother mentioned that they are registered at BB&B so I figured that was her telling FH that we need to send a gift (which I was planning to do anyway). Well their registry has some ridiculously overpriced items and everything in a lower range has already been purchased. I feel the invitation was rude and I kind of took offense to it (FH and I are an interracial couple so sometimes we have difficulties with our backgrounds clashing). Is it wrong of me to send them a $25 gift card to BB&B and call it a day?