I agree with doing it at Costco. If you poke around their website you will see that you can download ICC profiles. Yes, Costco does color calibration.
Recently my local one had a machine problem, and they actually gave me a phone call to tell me it would be delayed.
That said, print 2 copies, one to view and one to keep in an archival, lightproof, packed with silica gel box, kept below 75 degrees, that is not to be opened for at least 30 years.
check out THE book on the subject http://www.wilhelm-research.com/book_toc.html