Weddingbee boards

Look up staffs of graphic design studios and contact them personally and ask if they can do it as a freelance gig for you. You can set it up so that you pay them a design fee, and you do all the printing and stuffing yourself throuhg Office Depot or staples (by the way both of those stores will copy, fold and cut for very cheap).

Buy Indian wedding invitations online. The designs are not always very Indian looking, and the cost per unit is low. 

Also consider omitting RSVP cards and envelopes altogether by writing "RSVP to xx email or xx phone number" right on the invitation. It'll keep your guests from procrastinating and save on stamps!