DIY wedding invitation budget

I set a budget of $3.50 per invitation, including envelopes and postage stamps.

The break down of each invitation:
Actual invitation = 50c (the paper was $1.00 per sheet, I was able to print 2 invitations on each page)
Fabric love heart on each invitation = free, it was left over fabric from another project
Paper sleeve = 30c (I used scrap book paper, each 1.20 and got 4 sleeves per page)
Bus transfer = 25c
RSVP postcard = 40c (I bought a 25 pack of card stock for $9.95 and was able to print 2 postcards per one sheet of card)
Gift registry = 25c
Personalised stamp for RSVP = 60c
Envelope = 50c
Postage per invitation = $1.10

TOTAL PER INVITATION = $3.90 (40c per invitation over budget....oops)