I would suggest posting in that sticky thread, because there are a lot of people there who have lots of experience with storage life.
All the colour work I've done is both from a long time ago, and in a commercial lab, so I'm not the best person to ask sourcing questions. It was my understanding that if you have specific Kodak product numbers, Beau Photo in Vancouver can order from the minilab suppliers they use to source other things. Someone recently posted something that contradicts that - I would suggest talking directly to Nicole at Beau.
I have the advantage of living blocks away from a US border crossing, so if product can be ordered for shipping to an address in Washington State, I can get it that way.