I purchased these DIY invites (each box contains 25, 50 total) for $30, I'll sell them for $15 for 50 invites. I'll cover postage for any US deliveries.
You can get the template online. The box contains 25 RSVP cards, 25 RSVP envelopes, 25 blank invites, 25 pieces of vellum, crystals, and 25 black and gray damask jackets. These invites are compatible with most home and office printers.
See pictures below, if interested, reply to this message. Thanks!