say you have this "friend" - your sorority "big sis."
she's the type of "friend" that is only "friendly" with you when it's convenient with her / when she needs something from you.
you talk to her maybe 3-4 times/year via FB status comments, and might get together if someone is in town for business (but it's not a high priority on her end)
she's getting married (her second wedding) - you weren't invited to the first wedding, weren't notified when she got pregnant/had her baby (she didn't acknowledge your wedding or child) - she told you about the divorce (because she wanted you to validate her choices, and brag about her new man) - but not the new engagement or anything related to the upcoming wedding.
she asks for your address (presumably to invite you to her wedding) - you know you're not willing to travel for the wedding, and are basically viewing the invite as a gift grab.
what is a "reasonable" gift to send in this situation? you don't want to be an asshole, but you feel like this person is basically a casual acquaintance, at best.