We’re really not keen on sending paper invites as we feel they will just...

We’re really not keen on sending paper invites as we feel they will just end up in the bin or lost before the wedding. Id love some kind of website/page that we can have all the information on and a possible guest list rsvp but no idea how to go about this without spending a fortune? (Ideally only want to be sending paper invites to relatives that dont use internet) thankyou