This site has the cutest designs for their return address stamps and they're way more affordable than most of the other sites out there ... these stamps are great Wedding Gift ideas because they save couples a ton of time and money when they're sending out their thank you notes!
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Number your RSVPs! Smartest advice I saw on Pinterest for wedding planning! Number the bottom of the RSVP card and log who has which number on a spreadsheet. Easiest way to track who still owes you an RSVP. When you don't get them back (and there will be many that you won't, its just how it goes) you know exactly who to confirm with.