Where to copy 5.5x8.5 for target wedding invitations, Help!?

Try calling copy places (a mom and pop place will usually go out of their way for business) tell them you can send them the image to be copied via a pdf fomat and see if they can do it that way. This way they wouldn't be copying it they would just be printing it. That may be the reason why. Copy machines do not copy that size but you can print that size.