money for wedding gift.

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So our friends are getting married but the bride is pregnant with their second child and they already live together. On their invitation they put the want money Instead of a gift. But I just don't want to give them money. Their the type of people that will never go out and spend their money they only will if other people pay for it. Their wedding is in someone's backyard. We were also told by the groom that he just wants guests to say hi take a cupcake and leave ! So my question is would it be fine to get them a gift card to a restaurant and a card ? What would you do ? Also they got a gift that we didn't register for when we got married so I don't feel bad about not giving cash