Thinking of ways to cut cost, RSVP cards and RSVP postage stamps would be about $75. Invitations would be about $60...altogether that'd spending over $130...on stationary that I know people are going to just throw away anyway! I feel like it would be more efficient to just have the wedding invite and note "please see back for details" and then mention "We have ___ seats reserved in your honor. Please RSVP by (date) at (website). Then I can stuff the envelopes with the BACK showing when they open it. I actually seen some templates for this...
I know my family and group of friends, most have just done RSVP by website or phone even! Many even mentioned having to end up call the person or text to confirm their attendance anyway. and wasted postage stamps for the RSVP. A lot of the older crowd is just family I talk to often so I know who is coming. There might be like 4 people that might not know how to RSVP online that I'd have to call up (these are my fiance's step grandparents that are like 90 and whom we met like twice but his mom really wants to invite them.
Another option is to just address it by listing the names of the people invited (if I want them all to come) to RSVP by the date at our website while mentioning this is where the registry is. I'm not sure how to word it right now. I feel like with all the older family friend Asians I know (culturally) if I address 'last name family' because they'd think all their grown children and their grandchildren are invited which is why I'm adamant about mentioning how many seats I have in their honor. Most Asian weddings are huge and don't even RSVP so it's very different culturally for my fiance's side of the family whereas my family is 'Americanized".